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#1 Help Me ! » Generating sines » 2006-01-25 09:09:24

Paul
Replies: 1

Yesterday I wrote asking the following

Hello

I have been trying to program some sine equations.

My hope has been to create a loop of 100 iterations to generate results from 0 to 1 which has been successful

I have started with i set to 0

I have incremented it by Pi/200 stopping when i gets to Pi/2

And sin(i) has produced 0 to 1 as hoped for.

The problem is how do I generate 0 to 1 to 0 again

I have tried stopping i when it gets to pi which works very well until the final loop where I get a tiny value. Can anyone help. Am i trying the impossible?


--------------------------



I was asked to supply the code. Here it is

It works great but the last value I get is

Sin = 1.12246908816338e-14

when I was hoping for 0

maybe it is just a rounding problem as suggested


---code---------------


//100 loops to produce sin results from 0 to 1;
//trace() outputs to screen

var loopCount=0;
var desiredLoops=100;

for (var i:Number=0;i<=Math.PI;i+= Math.PI/(desiredLoops*2)){
    trace("loopCount = "+loopCount);
    trace("Sin = "+Math.sin(i));
    loopCount++;
                   }

------------------------



One further question

How could I modify the code to produce

-1 to 0 to 1 to 0 to -1

#2 Help Me ! » Understanding Sines » 2006-01-24 11:19:17

Paul
Replies: 2

Hello

I have been trying to program some sine equations.

My hope has been to create a loop of 100 iterations to generate results from 0 to 1 which has been successful

I have started with i set to 0

I have incremented it by Pi/200 stopping when i gets to Pi/2

And sin(i) has produced 0 to 1 as hoped for.

The problem is how do I generate 0 to 1 to 0 again

I have tried stopping i when it gets to pi which works very well until the final loop where I get a tiny value. Can anyone help. Am i trying the impossible?

#3 Help Me ! » Sines » 2006-01-20 00:47:50

Paul
Replies: 4

Hello

I am trying to generate a set of sine curve values that range from 0 to 1 to 0

I am using seed values of 1 to 100

I have got close with the following formula but it's not correct

If i ranges from 0 to 100

then

x=sin(i/30)

gets me from 0 to
0.998045198613548 to
-0.190567962875485

how do I get from
0 to
1 to
0

using i

Thanks

#4 Help Me ! » Plots on a curve » 2006-01-19 01:17:22

Paul
Replies: 1

Hi

I am writing a computer progrom which plots a curve

I want to be able to input the start screen co-ordinated and the destination co-ordinates.

So for example. I may wish to start at 100,100 on the screen and end at 150,150. I want to plot a sine curve between these 2 points.

The formula I use to plot a sine curve is

x=x+1;
y=y-sin(degrees)*radius;

The - is required here for the program I am using

The question I have is is it possible to create a formula which plots a sine curve which hits 2 given points.

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