MATLAB: How to retrieve numbers from symbol

retrieve numbersymbolic

Hi all,

Suppose I have defined

syms x1 x2 x45;

I want to detect and retrieve the numbers 1, 2, 45 from x1, x2, x45. Is that possible in matlab?

Thank you.

Best Answer

syms x1 x2 x45;
str2double(regexp(char(x45),'\d','match'))

Related Solutions

MATLAB: How to define a vector of symbolic functions

You could try,

syms x
f = symfun([x1^2+x2-x3; x2+x3^2; x1*x2], x);

but that might instead create a single function that returns an array. More sure would be

f = arrayfun(@symfun, [x1^2+x2-x3; x2+x3^2; x1*x2], x)

You would have had to have defined x1, x2, and x3 before this, and it seems odd that you would define a function with argument x but not use x anywhere in the function.

MATLAB: Problem with symbolic math

syms x1 x2 x3
gr =[2*x1 + 2*x2;2*x1 + 4*x2 + 2*x3; 2*x2 + 4*x3]
p1 =[957/2500;-293/1250;371/5000];
gr2=subs(gr,{x1,x2,x3},{p1(1),p1(2),p1(3)})

Best Answer

Related Solutions

MATLAB: How to define a vector of symbolic functions

MATLAB: Problem with symbolic math

Related Question