Selasa, 18 Desember 2007
Your Comment
Terima kasih atas beberapa masukkan yang disampaikan baik melalui email ataupun shoutbox untuk blog ini. Berikut adalah tanggapan atas saran yang masuk :1. Pembahasan soal - soal dan kisi - kisi untuk Ujian Nasional akan segera muncul segera setelah 3 bab kumpulan soal yang tersisa selesai, be patient !2. Blog ini secara khusus memang hanya seputar matematika sma khususnya materi - materi yang
Kamis, 13 Desember 2007
Search Engine Optimize ( SEO )
Search Engine Optimize ( SEO ) adalah sebuah upaya yang dilakukan agar mendapatkan rangking yang baik pada hasil pencarian. Sebenarnya ada banyak teknik SEO ( klik disini ) yang bisa diterapkan agar kita bisa mendapat rangking yang baik di SERP ( Search Engine Result Page ).Tulisan ini bukan untuk membahas tentang SEO, karena saya juga tidak menguasai hal tersebut. So saya hanya ingin menunjukkan
Utak - atik Turunan
Ada dua soal yang kelihatannya bakal keluar di Ujian Nasional untuk materi turunan.1. Soal yang berkaitan dengan turunan berantai, biasanya lebih sering muncl dalam bentuk fungsi trigonometri.2. Soal yang berkaitan dengan aplikasi turunan, mencari nilai maksimum atau minimum suatu fungsi fungsi atau kadang juga mencari persamaan garis singgung suatu kurva
Selasa, 11 Desember 2007
Soal Turunan
Berikut adalah soal - sola materi turunan 2 tahun terakhir ( format wordnya dapat diklik disini :1. Jika f(x) = sin² ( 2x + π/6 ), maka nilai f′(0) = ….a. 2√3b. 2c. √3d. ½√3e. ½√2Soal Ujian Nasional tahun 20072. Turunan pertama dari f(x) = sin ( 3x² – 2 ) adalah f’(x) = ….a. 2 sin² ( 3x² – 2 ) sin ( 6x² – 4 )b. 12x sin² ( 3x² – 2 ) sin ( 6x² – 4 )c. 12x sin² ( 3x² – 2 ) cos ( 6x² – 4 )d. 24x
Kamis, 06 Desember 2007
Boring Stevey Status Update
I had an exciting morning of not getting fired today. Get this: I'm on a trip to Google's Mountain View headquarters, and was glancing at Reddit between meetings, and lo and behold, I was inexplicably in the Reddit Tabloids again, this time for being fired, or so people were speculating (far too hopefully, I might add. Geez.) Needless to say, I immediately put all my other work-related plans on "pause" while I tried to figure out whether I was, in fact, being fired. Can't accuse me of not having my priorities straight!
It turns out it was a minor mixup by an automated system, a system that decided to jump-start its own evolution by going directly from brownian motion to VP-level decision-making (2 evolutionary hops total. Hee.). This automated system had apparently just watched the movie Brazil, and thought it would be fun to send me off to Information Retrieval. So my account was disabled, from which lonely data point the Reddit crowd concluded that I must be getting fired right now, in real time, like OJ in his white SUV. And seeing as I was too surprised to think of a counter-hypothesis, I spent about 20 minutes in an undignified, trouser-soiling panic. Thanks, Reddit!
Anyhoo, after some friends inside Google had undone the mistake for me, I pondered the overall thrust of the Reddit comment thread ("You suck". "No, YOU suck." "Your mom sucks." comment score below threshold) and decided I really ought to write something. Otherwise I'm likely to fall off the wagon and disappear for a year. Time is just whooshing away. I wish I could get back to High School Time, where even a single hour-long class can seem like eternity, and 4 years is effectively infinite. Sigh.
I do have a bunch of half-finished blog posts lying around, but nothing has really gelled yet. So I guess I'll ramble about stuff I've been up to. You know. A status update. Blech.
Incidentally, I've decided to try to limit myself to roughly 1000-word posts, which is about the length of a newspaper column, near as I can tell. I'll prolly just call it 5000 non-whitespace characters, and write an Emacs function to tell me when I've gone over. Off the top of my head, maybe something like:
which, when I run
So... In 500-ish remaining words, here are the first things that come to mind as I sit in this comfy modern-looking couch in Building 43 of Google's Mountain View headquarters.
JavaScript
I've been doing a lot of JavaScript-related stuff lately. I don't know if JavaScript 2 (aka ECMAScript Edition 4) is going to be the Next Big Language, but it's certainly going to be a Next Big Language. (There's room for more than one, obviously.) And in the meantime, well, JavaScript 1.7 is working plenty well for me.
Let's see... I'm working on a book on Mozilla Rhino with Norris Boyd (the primary author of Rhino, now a Googler in Boston). It's coming along in bursts, and is probably about 10% complete after 3 months of dorking around with it on weekends between football games (that goes for both me and Norris, as it turns out, although his team is 12-0, dammit). But it should be a pretty cool book, assuming football season ever ends. The book is pretty much where all my Joke Output has been focused lately, which hopefully helps explain my recent blog drought.
I've been watching the EcmaScript Edition 4 fireworks with keen interest. While I wouldn't want to name any specific parties, for fear of offending someone, it seems to me that one party, whom I'll refer to as "Uncle Mike", is up to his perverted old tricks again. If, like many others, you feel that "Uncle Mike" is being a "complete dickwad" (to put it as euphemistically as I can) then you can help by getting all your friends and sales people and random family members to switch to Firefox. Really. It'll help.
You might also write a polite letter to your favorite Ecma General Assembly Voting Member Company, telling them how much you and your ten thousand closest friends are really looking forward to the imminent ratification of EcmaScript Edition 4. Or hell, spam all of them. That's what Uncle Mike does.
NBE
Continuing in the spirit of freeing all my cats from bag-imprisonment, I should also mention I've been working on an Ecma-262 compliant JavaScript interpreter in Emacs-Lisp. I used to have actual details here, but it ate up 1000+ words, so I'll just summarize for ya.
The short synopsis is that I'm building a complete JavaScript environment in Emacs-Lisp, with two goals: (1) create a world-class JavaScript IDE for Emacs, and (2) permit writing Emacs extensions in JavaScript, since (2a) people aren't exactly flocking to elisp, and (2b) JavaScript turns out to be a better language, now that I know them both in excruciating detail. Emacs is a great environment that needs a better extension language, and JavaScript seems well suited to navigate the popularity-vs.-elegance tightrope I'm faced with.
That's the elevator pitch: puts people to sleep in 20 seconds, guaranteed.
The status-in-brief is that I now have a fully functional, Ecma-262 compliant JavaScript interpreter and runtime in elisp, which began as a port of Narcissus. I'm currently reworking the parser and parse tree to be faster and more IDE-friendly. Next I'll need to turn the interpreter into a byte-compiler that emits Emacs-Lisp bytecode, which should enable it to run as fast as (or faster than) Emacs-Lisp. Then I'll need to actually write the IDE and the emacs host objects.
The whole thing looks to be at least a year out, at least on my current budget of 3 hours a week, so don't hold your breath. I'm giving priority to the IDE functionality, since I kinda need it for other projects, so that could potentially happen by summer.
If you happen to think of a clever name for this project, please let me know.
Other Stuff
Well, this 1000-word limit is... a toughie. I've already blown through it, although hopefully I get some slack for counting HTML tags. But I have to wrap up, so I'll close with some Unsubstantiated Random Thoughts that maybe I can clarify in upcoming crudely-truncated entries:
Google continues to be an astoundingly awesome place to work. Like my friend Dominic says, "it feels like I've won the lottery every day."
Our Rhino on Rails framework is still working great for us, and has finally begun to gain serious internal momentum at Google. Hopefully next year we can open-source it.
Interviewing for tech jobs at Google continues to be really hard (for both interviewer and interviewee), and I've accumulated enough truly useful interviewee-prep tips to merit a full blog post. Look for that one soon.
I still use Emacs to an extent that could justifiably be described as "unhealthy". I'd love to do another Effective Emacs post someday.
I still watch a lot of Anime. Currently watching Le Chevalier D'Eon, which is pretty awesome so far.
I taught my dog Cino to play guitar, a feat which so astounds people that they all say I should put it on YouTube, so there's Yet Another Side Project for me.
I'd love to write more about all this. The 1000-word limit seems to have made it feasible for me to create posts in a single sitting, with no bathroom breaks, provided I can actually go to 1500 "words". So hopefully in addition to all my side projects, I can blog more often.
And with that, I'm going to get back to my "day job" project(s), which are sadly confidential. But they're so cool that if I did tell you about them, you'd be so overwhelmed that you'd have to go sit in one of our $5000-ish massage chairs, like the dude sitting next to me right now.
Man this place rocks.
It turns out it was a minor mixup by an automated system, a system that decided to jump-start its own evolution by going directly from brownian motion to VP-level decision-making (2 evolutionary hops total. Hee.). This automated system had apparently just watched the movie Brazil, and thought it would be fun to send me off to Information Retrieval. So my account was disabled, from which lonely data point the Reddit crowd concluded that I must be getting fired right now, in real time, like OJ in his white SUV. And seeing as I was too surprised to think of a counter-hypothesis, I spent about 20 minutes in an undignified, trouser-soiling panic. Thanks, Reddit!
Anyhoo, after some friends inside Google had undone the mistake for me, I pondered the overall thrust of the Reddit comment thread ("You suck". "No, YOU suck." "Your mom sucks." comment score below threshold) and decided I really ought to write something. Otherwise I'm likely to fall off the wagon and disappear for a year. Time is just whooshing away. I wish I could get back to High School Time, where even a single hour-long class can seem like eternity, and 4 years is effectively infinite. Sigh.
I do have a bunch of half-finished blog posts lying around, but nothing has really gelled yet. So I guess I'll ramble about stuff I've been up to. You know. A status update. Blech.
Incidentally, I've decided to try to limit myself to roughly 1000-word posts, which is about the length of a newspaper column, near as I can tell. I'll prolly just call it 5000 non-whitespace characters, and write an Emacs function to tell me when I've gone over. Off the top of my head, maybe something like:
(defun blog-check ()
(interactive)
(save-excursion
(goto-char (point-min))
(let ((count 0))
(while (not (eobp))
(unless (looking-at "\\s-")
(incf count))
(forward-char))
(message "%s: %d chars, %d words"
(if (<= count 5000)
"OK so far"
"Dude, too long")
count
(/ count 5)))))
which, when I run
M-x blog-check, faithfully reports:"You suck." "No, YOU suck." "Your mom sucks."Oops, sorry. Wrong macro. My new function actually tells me:
OK so far: 2177 chars, 435 words.Halfway there, baby!
So... In 500-ish remaining words, here are the first things that come to mind as I sit in this comfy modern-looking couch in Building 43 of Google's Mountain View headquarters.
JavaScript
I've been doing a lot of JavaScript-related stuff lately. I don't know if JavaScript 2 (aka ECMAScript Edition 4) is going to be the Next Big Language, but it's certainly going to be a Next Big Language. (There's room for more than one, obviously.) And in the meantime, well, JavaScript 1.7 is working plenty well for me.
Let's see... I'm working on a book on Mozilla Rhino with Norris Boyd (the primary author of Rhino, now a Googler in Boston). It's coming along in bursts, and is probably about 10% complete after 3 months of dorking around with it on weekends between football games (that goes for both me and Norris, as it turns out, although his team is 12-0, dammit). But it should be a pretty cool book, assuming football season ever ends. The book is pretty much where all my Joke Output has been focused lately, which hopefully helps explain my recent blog drought.
I've been watching the EcmaScript Edition 4 fireworks with keen interest. While I wouldn't want to name any specific parties, for fear of offending someone, it seems to me that one party, whom I'll refer to as "Uncle Mike", is up to his perverted old tricks again. If, like many others, you feel that "Uncle Mike" is being a "complete dickwad" (to put it as euphemistically as I can) then you can help by getting all your friends and sales people and random family members to switch to Firefox. Really. It'll help.
You might also write a polite letter to your favorite Ecma General Assembly Voting Member Company, telling them how much you and your ten thousand closest friends are really looking forward to the imminent ratification of EcmaScript Edition 4. Or hell, spam all of them. That's what Uncle Mike does.
NBE
Continuing in the spirit of freeing all my cats from bag-imprisonment, I should also mention I've been working on an Ecma-262 compliant JavaScript interpreter in Emacs-Lisp. I used to have actual details here, but it ate up 1000+ words, so I'll just summarize for ya.
The short synopsis is that I'm building a complete JavaScript environment in Emacs-Lisp, with two goals: (1) create a world-class JavaScript IDE for Emacs, and (2) permit writing Emacs extensions in JavaScript, since (2a) people aren't exactly flocking to elisp, and (2b) JavaScript turns out to be a better language, now that I know them both in excruciating detail. Emacs is a great environment that needs a better extension language, and JavaScript seems well suited to navigate the popularity-vs.-elegance tightrope I'm faced with.
That's the elevator pitch: puts people to sleep in 20 seconds, guaranteed.
The status-in-brief is that I now have a fully functional, Ecma-262 compliant JavaScript interpreter and runtime in elisp, which began as a port of Narcissus. I'm currently reworking the parser and parse tree to be faster and more IDE-friendly. Next I'll need to turn the interpreter into a byte-compiler that emits Emacs-Lisp bytecode, which should enable it to run as fast as (or faster than) Emacs-Lisp. Then I'll need to actually write the IDE and the emacs host objects.
The whole thing looks to be at least a year out, at least on my current budget of 3 hours a week, so don't hold your breath. I'm giving priority to the IDE functionality, since I kinda need it for other projects, so that could potentially happen by summer.
If you happen to think of a clever name for this project, please let me know.
Other Stuff
Well, this 1000-word limit is... a toughie. I've already blown through it, although hopefully I get some slack for counting HTML tags. But I have to wrap up, so I'll close with some Unsubstantiated Random Thoughts that maybe I can clarify in upcoming crudely-truncated entries:
Google continues to be an astoundingly awesome place to work. Like my friend Dominic says, "it feels like I've won the lottery every day."
Our Rhino on Rails framework is still working great for us, and has finally begun to gain serious internal momentum at Google. Hopefully next year we can open-source it.
Interviewing for tech jobs at Google continues to be really hard (for both interviewer and interviewee), and I've accumulated enough truly useful interviewee-prep tips to merit a full blog post. Look for that one soon.
I still use Emacs to an extent that could justifiably be described as "unhealthy". I'd love to do another Effective Emacs post someday.
I still watch a lot of Anime. Currently watching Le Chevalier D'Eon, which is pretty awesome so far.
I taught my dog Cino to play guitar, a feat which so astounds people that they all say I should put it on YouTube, so there's Yet Another Side Project for me.
I'd love to write more about all this. The 1000-word limit seems to have made it feasible for me to create posts in a single sitting, with no bathroom breaks, provided I can actually go to 1500 "words". So hopefully in addition to all my side projects, I can blog more often.
And with that, I'm going to get back to my "day job" project(s), which are sadly confidential. But they're so cool that if I did tell you about them, you'd be so overwhelmed that you'd have to go sit in one of our $5000-ish massage chairs, like the dude sitting next to me right now.
Man this place rocks.
Senin, 03 Desember 2007
Tips dan Trik Matematika
Sebenarnya saya kurang setuju dengan cara - cara yang digunakan oleh beberapa bimbingan belajar ( kayaknya hampir semua bimbel ) yang mengajar trik - trik tertentu ( kadang disebut sebagai rumus cepat ) untuk mengerjakan soal matematika.1. Saya kadang suka mendapat pertanyaan dari siswa " apakah ada rumus cepatnya pak ? " jika sebuah soal terkesan agak sedikit menjelimet dalam proses pencarian
Useful online mind maps
While surfing internet, I get to know about some good readymade mind maps. Here are the links of them...
1. On Pythagoras theorem http://agutie.homestead.com/files/pythagoras/pythagoras_proof_mind_map.html
2.Geometry help
http://agutie.homestead.com/files/mindmap/geometry_math_com_help.html
3.Euclid's elements
http://agutie.homestead.com/files/mindmap/mindmap_elements_000.html
4.weblog
http://agutie.homestead.com/files/mindmap/mindmap_blog_weblog.html
5.Optical illusion
http://agutie.homestead.com/files/mindmap/optical_illusion.html
Mindmap Instructions:
To see a note, hover over a note button above.
To Fold/Unfold a node, click the node or right click a Node and select Fold/Unfold all from Node. To scroll the mindmap above, drag the map's background and move it around, or click on background and use the arrow keys.
To link to another page, click a link button above. Buttons above: Search, Go to, Zoom in or CTRL '+', Zoom out or CTRL '-', Reset (center), Shadow On/ Off, FreeMind, BG color.
1. On Pythagoras theorem http://agutie.homestead.com/files/pythagoras/pythagoras_proof_mind_map.html
2.Geometry help
http://agutie.homestead.com/files/mindmap/geometry_math_com_help.html
3.Euclid's elements
http://agutie.homestead.com/files/mindmap/mindmap_elements_000.html
4.weblog
http://agutie.homestead.com/files/mindmap/mindmap_blog_weblog.html
5.Optical illusion
http://agutie.homestead.com/files/mindmap/optical_illusion.html
Mindmap Instructions:
To see a note, hover over a note button above.
To Fold/Unfold a node, click the node or right click a Node and select Fold/Unfold all from Node. To scroll the mindmap above, drag the map's background and move it around, or click on background and use the arrow keys.
To link to another page, click a link button above. Buttons above: Search, Go to, Zoom in or CTRL '+', Zoom out or CTRL '-', Reset (center), Shadow On/ Off, FreeMind, BG color.
Rabu, 28 November 2007
Selasa, 20 November 2007
Page Rank
Sebenarnya saya tidak terlalu ngerti banget makhluk apakah page rank itu ? Konon penilaian yang diberikan berdasarkan banyaknya tautan yang dilakukan oleh situs lain terhadap situs tersebut. 2 hari yang lalu iseng coba ngecek pagerank di beberapa situs untuk mengecek blog ini, ternyata hasilnya sebagai berikut :1. http://www.top25web.com/pagerank2. http://seopen.com/seopen-tools/pagerank.php3.
Practising Venn diagrams
Click on the given link to use the online tool for practising about venn diagrams .
http://mathdl.maa.org/images/upload_library/3/Jimenez/VD3_Numbers-NOTATION_01.html
http://mathdl.maa.org/images/upload_library/3/Jimenez/VD3_Numbers-NOTATION_01.html
Senin, 19 November 2007
Writing Mathematics
In mathematics we need to type it as it is done in the classroom or given in the text books.By this I mean to say that we have to write correct mathematics also, when we are posting information for our students.I was looking for some free software or facility which could solve this problem of mine as well as the students. While surfing internet, I stumbled upon a free equation editor. It has solved all my problems of writing mathematics. And the best part is ,it is free and can be inserted in a blog/website ,through the HTML code provided.
You may get this from http://www.sitmo.com/latex/
You may get this from http://www.sitmo.com/latex/
Utak atik Lingkaran
Materi lingkaran termasuk materi yang hanya keluar 1 soal tiap tahunnya. Pokok bahasan yang sering muncul adalah mengenai persamaan garis singgung yang menyinggung lingkaran. Pada tahun 2006 dan 2005 soal lingkaran muncul sebanyak 2 soal, akan tetapi di tahun 2007 hanya 1 soal. Sepertinya kehadirannya di 2 tahun tersebut karena sebelumnya pokok bahasan lingkaran muncul bersama irisan kerucut
Jumat, 16 November 2007
Soal Lingkaran
Berikut adalah soal lingkaran 2 tahun terakhir1. Salah satu persamaan garis singgung lingkaran ( x – 2 )² + ( y + 1 )² =13 di titik yang berabsis –1 adalah ….a. 3x – 2y – 3 = 0b. 3x – 2y – 5 = 0c. 3x + 2y – 9 = 0d. 3x + 2y + 9 = 0e. 3x + 2y + 5 = 0Soal Ujian Nasional tahun 20072. Persamaan garis singgung lingkaran x² + y² – 2x – 6y – 7 = 0 di titik yang berabsis 5 adalah ….a. 4x – y – 18 = 0b. 4x
Kamis, 08 November 2007
Rabu, 07 November 2007
Utak - atik Persamaan Linier
Kalau melihat kehadirannya pada Ujian Nasional ( 3 tahun terakhir ), soal persamaan linier lebih banyak tampil dalam soal cerita. Meskipun tampil dalam bentuk cerita tetapi merubahnya menjadi persamaan matematika ( 2 tahun terakhir 3 variabel, kelihatannya tahun depan soal yang keluar juga bakal 3 variabel )tidak terlalu sulit.So, untuk bisa mengerjakan soal ini di Ujian Nasional :1. Anda harus
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