SUBSTITUTIONS IN SYMBOLIC EXPRESSIONS

substitute

asked 2019-03-24 19:43:13 +0100

idriskameni
11 ●1 ●1 ●2

Hi,

I would like to know if it is possible to substitute expressions inside some equation or expression.

Consider the following expression:

$$(r+1)\cdot(r+2)+g+a$$

Then, I would like to say that I want this same expression for $c+d = 2\cdot r + a$.

Is this possible?

Can I implement something like this in SAGE?

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Comments

I think you should explain a bit more what you are looking for. If, for example, you only want to replace $a$ in the expression by its value from the equality, you can simply do this:

var("a,c,d,g,r")
expression = (r+1)*(r+2) + g + a
expression.subs(a=c+d-2*r)

Juanjo ( 2019-03-25 19:30:45 +0100 )edit

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SUBSTITUTIONS IN SYMBOLIC EXPRESSIONS

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