wrote the code but the error says Unrecognized function or variable 'a'. Error in firle (line 13) Z = A(a)*B(b);

Question

Riddhi Patel 2020-7-30

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https://ww2.mathworks.cn/matlabcentral/answers/572593-wrote-the-code-but-the-error-says-unrecognized-function-or-variable-a-error-in-firle-line-13

回答： Image Analyst 2020-7-31

x= (0:.1:5);
y= (0:.1:5);
 
[X,Y] = meshgrid(x,y);
for n=1:7
    for m=1:7
        
       A = @(a) (2/sqrt(a))*sin((m*pi/5)*a);
       B = @(b) sin((n*pi/5)*b);
       Z = A(a)*B(b);
       [X,Y,Z] = meshgrid(x,y,z);
       surf(x,y,Z) 
       
    end
end

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Answer 1

Cris LaPierre 2020-7-30

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The issue is with the line Z = A(a)*B(b);

You have not defined the variable 'a' or 'b'. That is resulting in the error you see. Did you mean to use n and m?

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Answer 2

Image Analyst 2020-7-31

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在 MATLAB Online 中打开

Perhaps you wanted this:

x = 0 : 0.1 : 5;
y = 0 : 0.1 : 5;
[X, Y] = meshgrid(x, y);
a = X(:);
b = Y(:);
numElements = numel(a);
n = linspace(1, 7, numElements)';
m = n;
A = (2 ./ sqrt(a)) .* sin((m * pi/5) .* a);
B = sin((n * pi/5) .* b);
Z = A .* B;
% Reshape from column vector into 2-D
Z = reshape(Z, length(x), length(y));
surf(X, Y, Z)
xlabel('x', 'FontSize', 18);
ylabel('y', 'FontSize', 18);
zlabel('z', 'FontSize', 18);