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 how to set matrix values?		  New Topic  Reply to Topic
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circumvent

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Posted - 07/29/2009 :  10:06:27 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
I want to plot a cut 3D surface, for example z=x^2+y^2, plot the range from -10 to 10 for x and y

Now I create a new matrix, set dimentions, x and y cooridinates from -10 to 10, then I set value, cell(i,j)=x^2+y^2.Everything works.


Next I only want to plot half of the data, for example, only x>y+1. So I get the script Windows out. I understand that I should make a i and j loop to call cell(i,j). But how should I assign the x, y values to the Matrix?
The idea should be
loop (ii,1,32)
{
loop (jj,1,32)
{
if (x>y+1) z=x^2+y^2.
else z=0.



}
}

Thanks.

larry_lan

China
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Posted - 08/03/2009 :  10:47:22 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi:

You can create an Origin C function like:

double setmatrixvalue(double x, double y)
{
	if (x>y+1)
	{
		return x^2+y^2;
	} else
	{
		return 0;
	}
}


And Call this function in Set Matrix Value like

Cell(i, j) = setmatrixvalue(i, j)


Thanks
Larry
OriginLab Technical Services
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