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

Question

shahariar Ryehan 2022-6-12

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1738995-z-must-be-a-matrix-not-a-scalar-or-vector

回答： Walter Roberson 2022-6-12

I could't find the Problem. Need a help!!!

%variable declare
syms x;
syms t;
%putting the value
a=1;
b=-2;
c=-1;
alpha=1;
p=0;
%mesh plot
x = -3:.1:3;
y = -3:.1:3;
[X,Y] = meshgrid(x,t);
%vartheta equation
vartheta = ((a/alpha)*X.^alpha)+((b/alpha)*p^alpha)+c*t;
%delta equation
delta=-(2*c)/(b*a^2);
%main function
Z=-(2*(c^2)*((tanh(sqrt(-delta).*vartheta)).^2))/(b*delta*a^3);
mesh(X,Y,Z)
grid on
hold on

Result:

Error using mesh (line 71)

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

Error in M3_1_29_3 (line 30)

mesh(X,Y,Z)

2 个评论
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Torsten 2022-6-12

编辑：Torsten 2022-6-12

在 MATLAB Online 中打开

Why do you define

y = -3:.1:3

and don't use "y" anywhere in your code ?

And in order to plot, t must be given a value - i can't remain a symbolic variable.

Why do you use symbolic variables at all ?

Jeffrey Clark 2022-6-12

Asuming you meant to use y or Y where t is used, vartheta should be computed as a matrix since X is used, and therefore Z would be a matrix. Since the error indicates that Z is not a matrix the code you shared must have other copy and paste issues. Please retest after removing the syms lines which may be causing some of the issue. Then upload that code if it still gives the error or something else.

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