Replacing symbolic subexpression with unspecified arguments

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Hello,
I would like to do a symbolic computation where I have to replace a subexpression with another.
However I can not use the subs instruction, since the parameters are changing:
syms a1 a2 a3 a4 x1 x2 x3 x4 y
y = sin(a1 * sin(x1))
%%Could be any ai and xi
Is there a way to replace the outer sin() with another symbolic function regardless of the parameters?
I'd assume that matlab uses an internal expression tree, but I don't think it's accessible.

Accepted Answer

Walter Roberson
Walter Roberson on 18 Mar 2022
syms a1 a2 a3 a4 x1 x2 x3 x4 y
y = sin(a1 * sin(x1))
y = 
cos(children(y, 1))
ans = 

More Answers (2)

Paul
Paul on 18 Mar 2022
Not 100% clear on the question. Maybe this?
syms a1 a2 a3 a4 x1 x2 x3 x4
syms a x
y(a,x) = sin(a * sin(x))
y(a, x) = 
y(a2,x2)
ans = 

Roman Frels
Roman Frels on 19 Mar 2022
Thank you for the answers!
Best regards

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