Hello I was trying to plot using the following code but i get this error. Can someone help me please? Thank You

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Abdollah Sedaghat 2018-8-26

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https://ww2.mathworks.cn/matlabcentral/answers/416280-hello-i-was-trying-to-plot-using-the-following-code-but-i-get-this-error-can-someone-help-me-pleas

关闭： MATLAB Answer Bot 2021-8-20

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clc;
clear;
close all;
qc=pi/.15;
delta=0.01;
[X,Y] = meshgrid(0:0.1:1,0:0.1:1);
for alpha=[0.3,0.5,0.7]
    for(i=1:11)
        syms q ;
        A=(q^2*coth(q))/(((1+q^2*(X(i))^2/(2*alpha)))^(1+alpha));
        B=(q^2*coth(q))/(((1+q^2*(Y(i))^2/(2*alpha)))^(1+alpha));
        ASK1=int(A,0,qc);
        ASK2=int(B,0,qc);
        Z(i)=(1+(delta)^2*X(i)^2*ASK1)+((delta)^2*Y(i)^2*ASK2);
    end
    hold on;
    surf(X,Y,Z)
end

z must be a matrix not a scalar or vector

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Rik 2018-8-26

The error is self-explanatory: the surf function requires a matrix as a third input, not a symbolic vector. Also, your Z vector has only 11 elements, while the grid you're trying to plot to is 11 by 11.

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