How to create a symbolic expression with a string like '5.01e-7*x2 - 5.01e-7 + (-9*x1 + 4)/x1'?

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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!

采纳的回答

John D'Errico
John D'Errico 2018-6-29
str2sym( '5.01e-7*x2 - 5.01e-7 + (-9*x1 + 4)/x1')
ans =
0.000000501*x2 - (9*x1 - 4)/x1 - 0.000000501

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