MATLAB: How to create a symbolic expression with a string like ‘5.01e-7*x2 – 5.01e-7 + (-9*x1 + 4)/x1’

Question

The string is '5.01e-7*x2 – 5.01e-7 + (-9*x1 + 4)/x1'

I want to create syms x1,x2 and symbolic expression: 5.01e-7*x2 – 5.01e-7 + (-9*x1 + 4)/x1

Many thanks!

Answer 1

str2sym( '5.01e-7*x2 - 5.01e-7 + (-9*x1 + 4)/x1')
ans =
0.000000501*x2 - (9*x1 - 4)/x1 - 0.000000501