MATLAB: Sym

sym

Hi,

how can I change format of sym number? For example:

a=sym(2.34353453465464);
b=sym(4.6546455789879324352);
format short
c=a*b

Format short doesn't work.

Thanks

Use vpa, e.g.,

c = vpa(a*b,4)

'(heaviside(x)-heaviside(x-1))'*x.^2 means the string '(heaviside(x)-heaviside(x-1))' matrix-multiplied by the element-wise square of x.

Anything in quotes is a string, not symbolic.

Also, matlabFunction() returns a function handle, not a symbolic function.

syms x
(heaviside(x)-heaviside(x-1)) * a

would be a symbolic expression. You could matlabFunction() the result, I suppose.

Use the subs function inside the vpa call:

syms a b c
c=a+b;   a=1;   b=1;
vpa(subs(c))

produces:

ans =
2.0