MATLAB: Plotting error message

errorMATLABplot

Hi,
I am running this code:
y1 = 0:.01:1;
for y2=0:1/10:1;
l=1+y2*10;
t(:,l) = y1.^3./12 + (y1.^2.*y2)/4 - y1.^2./2 + (y1.*y2.^2)/4 - y1.*y2 + y1 
- (7.*y2.^3)/12 + (3.*y2.^2)/2 - y2;
end
plot(y1,t)
and get this error:
Subscript indices must either be real positive integers or logicals.
However when I run this code:
y1 = 0:.01:1;
for y2=0:1/10:0.5;
l=1+y2*10;
t(:,l) = y1.^3./12 + (y1.^2.*y2)/4 - y1.^2./2 + (y1.*y2.^2)/4 - y1.*y2 + y1 
- (7.*y2.^3)/12 + (3.*y2.^2)/2 - y2;
end
plot(y1,t)
There is no problem! (only difference is the 3rd line)
Can someone explain why I cannot do the first one?
Best,
David

Best Answer

You have the line:
 l=1+y2*10;
and then you try to use that to index the columns of t(), but you actually have an index not equal to an integer
l =
   7.000000000000001
I'm not sure why you're trying to do here, but how about
   l=1+round(y2*10);
That should enable your loop to run and produce your plot.
Related Question