Using Contour to plot different range data.
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Katarina
on 18 Mar 2013
Commented: Walter Roberson
on 14 Jul 2016
For the past 2 hours I am trying to plot my x,y,z data using contour and even after reading examples from MATLAB I am still at the same place. Just for learning purposes I am using dummy data that I have created shown below:
x=1:0.5:20;
y=1:0.5:10;
z=zeros(39,19);
for i=1:1:39
for j=1:1:19
z_value=x(j)+y(j)^2-2*x(i);
z(i,j)=z_value;
end
end
for i=1:1:38
for j=1:1:19
plot3 (x(i),y(j),z(i,j),'ro-')
hold on
end
end
While I am good with plotting it all in 3D, I would like to plot contours however, whenever I try to plot contour(x,y,z) it gives me following message:
*******************************
Error using contour (line 81)
The size of X must match the size of Z or the
number of columns of Z.
Error in test (line 23)
contour (x,y,z)
*******************************
The size of X and Y do match Z! So I am not sure what I am missing. If I cannot use contour, can you please suggest another method in order to obtain similar effect graphing tool?
Thank you for your time.
0 Comments
Accepted Answer
Walter Roberson
on 18 Mar 2013
length(x) matches the number of rows in z, but it needs to match the number of columns in z.
Try
contour(x, y, z.')
3 Comments
McWoz
on 14 Jul 2016
So, I have changed my X vector to match the columns of Z, but I am still getting this error... is there a bug?
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