HOW TO SOLVE THIS?

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daniel
daniel 2023-1-1
评论： Voss 2023-1-3
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Walter Roberson
Walter Roberson 2023-1-1
In the case of that error message, the problem is that you had accidentally created a variable named velocity that you are then trying to index. If there is a variable in scope and a function of the same name, MATLAB gives priority to the variable in scope.

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Image Analyst
Image Analyst 2023-1-1
Ran in:
Try this:
v = velocity([0, 5.6, 7], [0, 1.1, 2.4], [0, 4, 20], [0, 1, 2])
v = 1×2
6.9692 16.1137
function v = velocity(x,y,z,t)
v = [];
if ~isequal(size(x), size(y)) || ~isequal(size(x), size(z)) || ~isequal(size(x), size(t))
uiwait(errordlg('Sizes do not match'));
return;
end
v = sqrt(diff(x).^2+diff(y).^2+diff(z).^2)./diff(t);
end
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daniel
daniel 2023-1-1
its working tnks
Voss
Voss 2023-1-3
@daniel: isequal accepts more than two input arguments and returns true if and only if all the inputs are equivalent.
That is, you can replace this:
if ~isequal(size(x), size(y)) || ~isequal(size(x), size(z)) || ~isequal(size(x), size(t))
with this:
if ~isequal(size(x), size(y), size(z), size(t))
Reference: https://www.mathworks.com/help/matlab/ref/isequal.html#d124e801938

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