how to make an anonymous function with more than 1 statement or equation?

Question

Alfandias Saurena 2022-2-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1651965-how-to-make-an-anonymous-function-with-more-than-1-statement-or-equation

回答： Walter Roberson 2022-2-17

采纳的回答： Stephen23

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for exmple, i have 2 or more equation (a and d), with some variable defined (B and C).

B=2

C=4

a=Bx;

d=Cx^2;

then, i want to solve :

sqrt(a+d)

B=2;
C=4;
f=@(x) (a=B*x) (d=C*x^2) sqrt(a+b);
Unsupported use of the '=' operator. To compare values for equality, use '=='. To specify name-value arguments, check that name is a valid identifier with no surrounding quotes.
f(2)

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Answer 1

Stephen23 2022-2-17

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https://ww2.mathworks.cn/matlabcentral/answers/1651965-how-to-make-an-anonymous-function-with-more-than-1-statement-or-equation#answer_898310

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Using anonymous functions:

B=2;
C=4;
Fa = @(x) B.*x;
Fd = @(x) C.*x.^2;
Fh = @(x) sqrt(Fa(x)+Fd(x));
Fh(2)
ans = 4.4721

Using the symbolic toolbox:

syms x

a = B*x;

d = C*x^2;

s = sqrt(a+d)

s =

double(subs(s,2))

ans = 4.4721

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Alfandias Saurena 2022-2-17

thanks @Stephen,, i apreciate it

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Answer 2

Arif Hoq 2022-2-17

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https://ww2.mathworks.cn/matlabcentral/answers/1651965-how-to-make-an-anonymous-function-with-more-than-1-statement-or-equation#answer_898305

编辑：Arif Hoq 2022-2-17

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B=2;
C=4;
f=@(x) B*x +C*x^2;
% d=@(x) C*x^2
sqrt(f(2))
ans = 4.4721

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Answer 3

Walter Roberson 2022-2-17

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https://ww2.mathworks.cn/matlabcentral/answers/1651965-how-to-make-an-anonymous-function-with-more-than-1-statement-or-equation#answer_898325

To answer your original question as phrased:

I suspect that you could do that with careful use of having the anonymous function invoke evalc() with a character vector that was a command line that used evalin('caller') to retrieve the parameter, and assingin('base') to save the variable, and then a series of assignin('base') and evalin('base') calls.

This would not be recommended even a little, but you did not ask for our recommendations, only for how to do that task using multiple statements inside an anonymous function.

The approaches shown by Stephen are much better. I would have to have a really good reason to use the approach I outlined above, at least for anything other than proving it could be done.