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i have problem in uses of inline or syms ordes

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xosro
xosro 2015-5-16
评论： Walter Roberson 2015-5-16
i want have a variable like x that define on x ,f(x) function,then program does math operators on f(x) and compute the result of this operators for specified x,
for example in During the a code i want define x with syms order and obtain f=x^2+x+1, then compute f(1)^2

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Walter Roberson
Walter Roberson 2015-5-16
syms x
f = x^2+x+1;
subs(f^2,x,1)
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xosro
xosro 2015-5-16
编辑：Walter Roberson 2015-5-16
your answer has was correct but matlab does not know answer of subs(y^2,x,1) as a logic number for example when i run
>>syms x
>>f = x^2+x+1;
>>subs(f^2,x,1)
>>ans=
>> ans>1
ans =
1 < 9
Walter Roberson
Walter Roberson 2015-5-16
The result of a computation with symbolic values is a symbolic value. If you want the closest floating point equivalent, double() the symbolic value. For example,
double(subs(f^2,x,1))

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