How to show in edittext the polynomial ordered from highest to lowest grade?

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Erwin Avendaño 2017-11-4

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编辑： Walter Roberson 2017-11-5

What happens is that my program in edittext edit the polynomial but all messy can you print but in an orderly way? From highest to lowest?

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Answer 1

Walter Roberson 2017-11-4

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Use the two-output form of coeffs to extract the coefficients and the corresponding powers. The powers will be sorted in descending order. You can then construct a character string from the parts.

[cs, pows] = coeffs(YourPolynomial, AppropriateVariable);
 temp = sprintf( '%s * %s +', [cs(:), pows(:)].' );   %transpose is important
 temp(end-1:end) = [];   %trim trailing ' +'

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Erwin Avendaño 2017-11-5

y = is the polynomial that is obtained after doing operations in my program z=simplify(y) set(handles.edit23,'String',char(z))

Walter Roberson 2017-11-5

编辑：Walter Roberson 2017-11-5

syms x y = expand((x-1)^3+x);

[cs, pows] = coeffs(y, x); z = sprintf( '%s * %s + ', [cs(:), pows(:)].' ); %transpose is important z(end-2:end) = []; %trim trailing ' + ' set(handles.edit23,'String',char(z))

You can get fancier, such as suppressing '1 *' if it occurs, or the final '* 1' if it occurs, and by handling negative values. The easiest way to handle those is probably to do some pattern matching on z using regexprep.

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