Not getting the expected size matrix from evaluating a function handle that is equal to zero

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

surf(X,Y,Z)

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更多回答（2 个）

VBBV 2024-3-29

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2100536-not-getting-the-expected-size-matrix-from-evaluating-a-function-handle-that-is-equal-to-zero#answer_1433331

在 MATLAB Online 中打开

h = @(x,y) zeros(10)
h = function_handle with value:
    @(x,y)zeros(10)
[X, Y] = meshgrid(linspace(0, 2, 10));
Z = h(X,Y)
Z = 10×10
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
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Torsten 2024-3-29

在 MATLAB Online 中打开

Define

g = @(x,y,m,n) zeros(m,n)

in the script part

and use it as

Z = g(X,Y,size(X,1),size(X,2))

in your function.

Don't overcomplicate things - your code looks complicated enough.

Nilay Modi 2024-3-29

it works now, after changing to

g = @(x,y) zeros(size(x));

graph_surface( ...

g, ...

xy_limit=2.5, ...

FaceColor='interp')

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Steven Lord 2024-3-29

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2100536-not-getting-the-expected-size-matrix-from-evaluating-a-function-handle-that-is-equal-to-zero#answer_1433336

在 MATLAB Online 中打开

I am expecting Z to be zeros matrix of 10x10. But I am getting Z to be a 0 of 1x1.

Why?

Because that's what you told your function to return.

Based on your later comment, you don't want your function to return a 1-by-1 or even a fixed 10-by-10. You want it to return a zeros matrix the same size as the input. Correct?

f = @(X, Y) zeros(size(X));
X = ones(4)
X = 4×4
     1     1     1     1
     1     1     1     1
     1     1     1     1
     1     1     1     1
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f(X, X)
ans = 4×4
     0     0     0     0
     0     0     0     0
     0     0     0     0
     0     0     0     0
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Y = ones(5, 8)
Y = 5×8
     1     1     1     1     1     1     1     1
     1     1     1     1     1     1     1     1
     1     1     1     1     1     1     1     1
     1     1     1     1     1     1     1     1
     1     1     1     1     1     1     1     1
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f(Y, Y)
ans = 5×8
     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0
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Z = 42
Z = 42
f(Z, Z)
ans = 0