Expected a scalar and it should be a scalar

However it is quite likely that your approach using if is incorrect anyway. It appears that you are attempting an element-wise operation (which if does not do without a loop), namely replace values whose magnitude lies outside some value range, and so you probably should be doing something like this:

delta_Fx = max(-delta_Fx_max,min(delta_Fx_max,delta_Fx))

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Answer 2

Image Analyst 2019-5-30

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/464696-expected-a-scalar-and-it-should-be-a-scalar#answer_377258

Delta_Fx is an vector, so do you want to enter the "if" if any one is true, or only if ALL are true?

Use any or all as appropriate, according wo whatever you want. Some possible options depending on exactly what you want:

if any(delta_Fx < 0 & -delta_Fx > delta_Fx_max)
if all(delta_Fx < 0 & -delta_Fx > delta_Fx_max)
if all(delta_Fx < 0) && all(-delta_Fx > delta_Fx_max)
if all(delta_Fx < 0) && any(-delta_Fx > delta_Fx_max)
if any(delta_Fx < 0) && all(-delta_Fx > delta_Fx_max)
if any(delta_Fx < 0) && any(-delta_Fx > delta_Fx_max)

Note how sometimes I used & and sometimes used &&. I used a single & if I want to AND two multi-element vectors, and && if I want to AND two one-element boolean.