Error using mesh (line 71) Z must be a matrix, not a scalar or vector.

I am trying to get mesh plot

a=eletxt(:,1);

b=eletxt(:,2);

c=ele(:,5);

a1=table2array(theta(1:5:end,:));

b1=table2array(phi(1:5:end,:));

c1=table2array(phase(1:5:end,:));

u=mesh( theta1,phi1,phase1)

I am getting error saying

Error using mesh (line 71)

Z must be a matrix, not a scalar or vector.

Error in Untitled_phase (line 10)

u=mesh( theta1,phi1,phase1)

[Jan]

The error message is clear. You do not show, how theta1, phi1 and phase1 are created. Therefore there is no chance to know, why phase1 is not a matrix.

[FARHA KHAN]

Oh sorry I have edited that line I think it's not copied properly It's not theta1 phi1 and phase 1 It's a1,b1,c1

[FARHA KHAN]

I have rectified this error Thank you

Answer 1

[Harshit Saini]

As stated in the error, the “mesh” function takes in an input as a matrix. Mesh considers the row and column indices as the x-coordinate and the y-coordinate for the plot.

From the provided code snippet, it seems the parameters inside the “mesh” function are vectors, and not a matrix. I would suggest reshaping the variable accordingly using the following function,

A = 1:10;
B = reshape(A, [5,2])

You can read more about reshaping the arrays here,

https://in.mathworks.com/help/matlab/math/reshaping-and-rearranging-arrays.html

[FARHA KHAN]

Thank you for the response

Sir Its a matrix only sir

I have checked it with command ismatrix()