string from a textbox

2018 7 4
2 个回答
更新时间：2018 7 5
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hi. i want to extract 4,5,6,5 from string 4x^3 + 5x^2 + 6x^1 + 5

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Paolo
Paolo 2018-7-4
编辑：Paolo 2018-7-4

1 个投票

str = '4x^3 + 5x^2 + 6x^1 + 5'
num = regexp(str,'(?<!\^)(\d)','match');

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abdullah ek
abdullah ek 2018-7-5
i also want to extract the missing cofficients i am using the function sym2pol like syms x c = sym2poly(x^3 - 2*x - 5); but i dont know how to convert my value from textbox into symbolic polynomial which can be placed in sym2poly function.
Paolo
Paolo 2018-7-5
What missing coefficients? I don't see any for the equation you shared. Perhaps you need to use str2sym to convert the string to a symbolic expression before you can use sym2pol or coeffs as suggested by Stephen. I am unable to test it for you because of this bug.

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Stephen23
Stephen23 2018-7-5
编辑：Stephen23 2018-7-5

0 个投票

If you are using symbolic toolbox then you could use the appropriate function:
https://www.mathworks.com/help/symbolic/coeffs.html

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Paolo
Paolo
2018-7-5

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