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Variable calculations with matlab

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dav
dav 2013-3-7
Hi,
is it possible to get variable expressions in matlab?
For example:
From
>> y = (a+b)^2
Can I get
>> y = a^2+2ab+b^2

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Walter Roberson
Walter Roberson 2013-3-7
If you have the Symbolic toolbox,
syms a b
y = expand( (a+b)^2 )
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dav
dav 2013-3-7
I do have it but when I typed y = expand ((1-x)^-1)
the output is -1/(1-x)
How can I expand it using the binomial expansion?
thanks
Walter Roberson
Walter Roberson 2013-3-7
If the output has the leading - sign then that is the wrong expansion for (1-x)^(-1) which is 1/(1-x) with no leading minus sign.
1/(1-x) appears to already be in binomial expansion form to me. There is no Pascal's triangle entry for -1, and if you consider it as 1 divided by the binomial expansion of (1-x)^1 then it is already in the proper form.

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