Order terms in symbolic poly converted to string

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.

Answer 1

[Liam Ivers]

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')

[Sam Chak]

@Ethan Duckworth, Consider trying this "what-you-see-is-what-you-get" direct approach.

sympref("PolynomialDisplayStyle", "ascend");

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

T = 

titletext = ("$" + latex(T) + '$');
fplot(T), grid on
title(titletext, Interpreter='latex')

[Ethan Duckworth]

Weird that string(T) doesn't preserve the order of the terms, but that latex(T) does!

Answer 2

[James Tursa]

Brute force if you need the string for some reason?

syms x
ex = taylor(exp(x),order=3)

ex = 

[C,T] = coeffs(ex)

C = 

T = 

terms = fliplr(C.*T)

terms = 

n = numel(terms);
s = char(terms(1));
for k=2:n
    c = char(terms(k));
    if( c(1)=='-' )
        s = [s ' - ' c(2:end)];
    else
        s = [s ' + ' c];
    end
end
s

s = '1 + x + x^2/2'

[Ethan Duckworth]

Wholy cow! That works, but the shorter approach by @Liam Ivers is the one I accepted.