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

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xv cheng 2018-6-29

回答： John D'Errico 2018-6-29

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!

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