Vector And Magnitude - Two Points P1(30, 20) And P2(30, 221) And The Parametric Equation
Nov 22, 2011
I can't figure out this math problem. I have two points p1(30, 20) and p2(30, 221) and the parametric equation of the vector is (x-30)/(30-30)=(y-20)/(20-221)=t x=30, y=20-201*t
I'm thinking t is the magnitude or the distance. For a point P which is 10 pixels away from p1 on the vector, x=30, y=20-201*-10 (should be around -0.85) which is not the right P i'm looking for. Where am i doing wrong?
A while ago I wrote a "Vector data type" script using DOM interface to select.options. That was a (beautiful) mind game :-) rather than a practical thing to use.
Here is another attempt open for criticism, this time dead serious. I really need an effective Vector emulator for a project (as much effective as something not implemeted in language but emulated by means of the language itself is: a productivity impact is imminent, the question is to minimize it).
I have problem rendering vector layer on map only when is viewed from server. Local all is fine.
I'm using openlayers in combination with gpx file and txt for poi loations around route.
Look my code.
Here is link on webpage: [url]
Here is link on function: [url]
So. there should be red vector line reprizenting route from gpx file, but it is not. That is problem. when viewing localy on my pc, everithing is fine and working.
Im working on a project for my website where I would like to be able to change the value of a number by using js, and using getElemenById. For example:
"The taxi fare is $25" "A hamburger is $4"
In the above sentence I would like to be able to change the value of 25 & 4 by giving them an id and then using js to increase (or decrease) their value, to allow for future inflation, without having to go back and manually change every number on lots of pages (if for example in 1 years time a hamburger is worth $6 then the info above is outdated and should be changed). If i could use a variable such as "RateUSD = 1" I could increase "1" to say "1.05" and it would increase the value of all id='USD' by 5% onload rather than having to manually change it by typing.
I so far have come up with the code below, but I think the reason it does not work is because I have created a circular equation - id='USD" is the start of the equation, but it is also in the equation itself, and it is the resulting answer, so effectively I have created "A = A*B", or in this case "25 = 25*1.1"
I chose "id" as I would like to be able to have different currencies (with different id, such as 'EURO','GBP', etc) on the same pages and on multiple pages. I'll crack it eventually, I would just like to know if I'm heading in the right direction, or is there a better method that I could use? I found plenty of example for changing text with "innerHTML", but so far I haven't seen any for updating numbers onload by calculation, except for forms, etc, which are different.
The code:
<html> <head> <script type="text/javascript"> function changeCurrency(){
[Code].....
I will later put the js in an external file with a link to it "...src="support-files/currencyChange.js" (or something like that), but for now I have put it on the same page.
I am looking to use the outputted data of the US Census' world population clock as the raw data for a javascript function on another site - does anyone know if it is possible, looking at their site?
I am having some trouble trying to fix my math equation to calculate the total rent by aquiring values from my form fields. Converting the date fields to days and finding the number of days via two date fields is mainly where I am having trouble. Also, I am trying to have a window pop up before submission but the onclick event does not seem to function properly.Below is the math equation I have come up with:
//calculate days from date field function calcTotal(date1, date2) { //assign variables
I am new to using Javascript and have been trying to incorporate this equation into my if statement but cannot get it to calculate properly no matter which method I use. Here is the function as I have it worked out presently.
Is it possible to have an input that points to some other function? For example: function someFunction() { alert('It worked.'); }function doAnotherFunction(doIt, otherFunction) { if (doIt == true) { otherFunction(); }} <input type="button" value="test" onClick="doAnotherFunction(true, someFunction());"> Or would I need a switch statement and have all the various functions hardcoded?
I am not a developer so not so familiar with javascript. Suppose I have a map with ten junctions and based on that map. I need to calculate all the possible routes between one junction to another. How do I represent the map in javascript and how do I code the function to calculate all the possible routes?
Suppose I have a map with ten junctions and based on that map, I need to calculate all the possible routes between one junction to another. How do I represent the map in javascript and how do I code the function to calculate all the possible routes?
I have a boss who wants to show 5000 points on a Google map. So far, only a fraction of this being displayed freezes the browser. I've been challenged to make this possible while still in the realm of the browser. Would the flash version of Google maps api be a better bet? Does flash provide a better framework for this kind of heavy usage?
I have this js function: <script type="text/javascript"> function updatesum() { document.PaymentForm.newbalance.value = (document.PaymentForm.balance.value -0) - (document.PaymentForm.paymentamount.value -0); } </script> I want to round the value of document.PaymentForm.newbalance.value to two decimal points.
I am trying to wrap a text selection with BBCode. I have it working, but there is one final part I need help with.[code]...
So, the last thing I need to do (the whole point of this post)... how do I MOVE the range start and end points so that only the selection is selected and NOT the whole thing?
I need to know how to get the actual screen size in points or cms, not in pixels. The javascript functions give me the pixels, but I need to know how many points or centimeters that is regardless if it comes from a browser or a device like an ipad or iphone. Does anyone know the code to calculate this?
Suppose I do (5 * 0.039) + 0.59, then the result is 0.7849999999999999 - but I want to round it upwards and should have only 3 digits after decimal point. I found out that using toFixed(3) will get it to be 0.785, but the problem is that it add x.x00 for some numbers where there aren't much decimal numbers. Is there a way I can remove the 0's?
I'm working on IE7. I've create two bullet point items (fred and john) inside a jquery tab but neither are appearing as bullet points. Here is my code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head><title>Odyssey Application</title>
I am trying to develop a form that can give an estimate to viewers based on their input and I'm having a problem with decimal points. I couldn't find a very good free script online so I've done some work with this one [URL] When you enter 10 in the input box, it calculate 10*19.99, giving 199.9, but I want it to show 199.90. I've tried adding toFixed(2) in there, but I'm not able to get that to work.
I am in the process of using the split function for splitting strings into an array. The problem I am dealing with is how to do this with local language. Not all languages us the space " " delimiter between words to write a phrase or sentence.
I have a list of all of delimiters for english, japanese, chinese, korean in Decimal Code Point format. For example, the decimal code point equivalent for " " is 32. Is it possible to use the javascript split function with decimal code points? If not, how can I reformat them into a format that js would understand?
[URL] If you go to this site in Chrome (or Safari) I get a Uncaught Error: INDEX_SIZE_ERR: DOM Exception 1 javascript error and my markers do not show up. In all other non-webket browsers I do not see this problem.
I've found the Harvesine forumla to get the distance between any two points of latitude and longitude on the earth's surface. What I want is a little different - I want that, given a point and a distance, to get the latitude and longitude of a second point. I'm having trouble reversing the forumla. The current formula:
In PS you press CTRL+T on new layer. 9 handles appears an then you can stretch/rotate/move that layer. Looking just for that stretch & rotate functionality with dotted/dashed retangle outline. That is, there should be 8 handles on rectangle boundarys and then rectangle should be rotated & stretched via those points. & moved via nineth center point.
