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Help me find fx from gx,f(fx) ?

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Nguyen Hoang Thien Phuoc
Nguyen Hoang Thien Phuoc on 4 Jan 2013
Find fx from gx and f(gx)
Ex:
find f(1/2) with gx=1-x^2 and f(gx)=(x^4+x^2)/(1+x^2)
syms x;
a=input(' a= ');
g=input(' gx= ');
f=input(' fx = ');
...?????? I don't know...please help me ! Thanks a lot!

Answers (1)

bym
bym on 5 Jan 2013
here is a start
clc;clear
syms x
gx = input('gx = ','s');
fx = input('f(gx) = ','s');
a = input('f(n) = ','s'); % 1/2 in your example
n = solve([gx '-' a],'x')
% f(1/2) = ? for you to complete
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