# Symbolic function

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Good day,

I'm new to Compose and i have some questions, i hope u can help me out.

What is the equivalence for syms function (in Matlab) in Altair Compose? And how can I derivate symbolically in this software?

I'm testing this software and trying to get used to it, so i'm programming a simple Newton-Raphson method, this is the way i did it with matlab:

syms x
fx=input('Enter the function: ')
dfx=diff(fx);
E=1; e=0.0001; i=1;
Ai=zeros(3,1); Axr=zeros(3,1); AE=zeros(3,1);
xo=input('Initial value:  ');
while E>e
fxp=subs(fx,xo);
dfxp=subs(dfx,xo);
xr=xo-fxp/dfxp;
E=abs((xr-xo)/xr);
xo=xr;
Ai(i)=i; Axr(i)=xr; AE(i)=E;
i=i+1;
end
Res=[Ai Axr AE]

and here it is the way i did it with compose:

f=@(x) exp(-x)-x;
df=@(x) -exp(-x)-1;
E=1; e=0.0001; i=1;
Ai=zeros(3,1); Ar=Ai; AE=Ai;
%xo=0;
xo=input('Initial value: ')
while E>e
fxp=f(xo);
dfxp=df(xo);
xr=xo-fxp/dfxp;
E=abs((xr-xo)/xr);
xo=xr;
Ai(i)=i; Ar(i)=xr; AE(i)=E;
i=i+1;
end
Res=[Ai Ar AE]

The questions are as stated above, because I want to differentiate any simple function I give as input.

btw, sorry for broken english.

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Hi Ivan,

Unfortunately oml language doesn't support yet symbolic math.

You can try to leverage Python-bridges provided by Compose though.

Cheers,

Lorenzo

Ivan likes this

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Oh, I understand.

Thank you so much for the information, I'll look into this new option you mentioned.