How can I replace an expression in a symbolic function with a new symbolic variable?

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Savino Petrignani
评论： madhan ravi 2018-7-6
Hello to everyone,
I am using the Symbolic Math Toolbox and, after some steps, I've obtained a very complex symbolic function f. In order to make it easier to read, I'd like to replace some terms of the function with new symbolic variables, but I don't know how.
For example, assuming that the f function is
f = sqrt(A^2 + A*B)
I want to replace the term A*B with a new symbolic variable C, so that
f = sqrt(A^2 + C)
How can I do that? Thanks in advance for your help.

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采纳的回答

madhan ravi
madhan ravi 2018-7-6
syms A B C
f = sqrt(A.^2+ A*B)
subs(f,A*B,C)
actually this works

更多回答（1 个）

Basil C.
Basil C. 2018-7-4
I assume that this should be what you are looking for
function result= C(A,B)
result=A*B;
end
But use this before the function f = sqrt(A^2 + C)
  2 个评论
Savino Petrignani
Savino Petrignani 2018-7-5
Actually, I don't have in my code
f = sqrt(A^2 + C)
but only
f = sqrt(A^2 + A*B)
In my complex function, the same expression appears several times and so I need to replace this expression with a new symbolic variable.

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