Order terms in symbolic poly converted to string

Question

Ethan Duckworth 2024-7-17，23:56

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https://ww2.mathworks.cn/matlabcentral/answers/2138277-order-terms-in-symbolic-poly-converted-to-string

评论： Ethan Duckworth 2024-7-18，10:55

采纳的回答： Liam Ivers

在 MATLAB Online 中打开

Is there a way to control the order of the terms in a symbolic polynomial that has been converted to string?

E.g. the following

syms x
T=taylor(exp(x),order=3);
string(T)

results in

ans = "x + x^2/2 + 1"

and I would rather have it as 1+x+x^2/2 or the reverse order. I'll be putting this in the title of a plot so if there is some other way to automatically get the correct order in the title that would work equally as well.

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Answer 1

Liam Ivers 2024-7-18，1:13

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编辑：Liam Ivers 2024-7-18，1:17

在 MATLAB Online 中打开

Use the sympref function to change the display of the symbolic polynomial:

I noticed that the string function does not update with this change(A = "x + x^2/2 + 1"), but it does if you use the latex command (B = '1+x+\frac{x^2}{2}') which may look better for plot headings.

syms x
T=taylor(exp(x),order=3)
sympref('PolynomialDisplayStyle','ascend')
A = string(T)
B = latex(T)
titletext = ("$" + latex(T) + '$')
title(titletext,Interpreter='latex')