Re: math functions' point of view

Posted by Jarek Grodek on
URL: http://imagej.273.s1.nabble.com/math-functions-point-of-view-tp3703556p3703564.html

Wayne Rasband napisał(a):

>> I'm newbie to ImageJ and wondering is there a possibility to
>> make it to create an artificial image according to specified
>> mathematic function, e.g. y=2x^2+b.
>
> Here is a macro that uses a math function to generate an image.
>
> -wayne
>
>   width = 500; height = 500;
>   xc = width/2; yc = height/2;
>   newImage("Math", "32-bit", width, height, 1);
>   for (y= 0; y<height; y++) {
>       for (x= 0; x<width; x++) {
>           xx = sqrt ((x-xc)*(x-xc)+(y-yc)*(y-yc));
>           setPixel(x, y, f1(xx));
>       }
>       if (y%20==0) showProgress(y, height);
>   }
>   resetMinAndMax();
>   makeLine(0, 0, width, height);
>   run("Plot Profile");
>   exit;
>
>   function f1(x) {return 2*x*x-3;}
>   function f2(x) {return cos(x/10);}
>   function f3(x) {return sqrt(x);}
>   function f4(x) {if (x==0) return 0; else return log(x);}
>   function f5(x) {return exp(x/100);}
>
>
>

WOW!

Wayne, thank you very much, i'm impressed of your help. This is exactly
what i was looking for: the example of macro construction.
Greetings

jarek