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use the "subs" command to subsitute equations for a variable

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Philosophaie
Philosophaie 2013-9-20
Here is a silly question: is there a way to use the "subs" command to subsitute equations for a variable?
eqn = 2*(2*x-1) + 3*(3*x+2) + 4*(4*x-5)=11
eqn1 = subs(eqn, {2*x-1,3*x+2,4*x-5}, {a,b,c}); ???
The result:
2*a+3*b+4*c=11 ???
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Walter Roberson
Walter Roberson 2013-9-20
It makes a difference as to whether the expressions appear exactly, or if instead you want an algebraic transformation. For example if the code had 2*x-2 and you substituted 2*x-1 -> a, then would you want the result to be a-1 or would you want the substitution to be skipped ?

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回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-9-20
syms x a
y=2*(2*x-1);
subs(y,a)

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