Formatting Matlab's output to Command Window

2020 12 3
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更新时间：2020 12 3
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I am trying to check a few symbolic equations by printing them to the Command Window. My Command Window prefrences are already defaulted to "short" output format for numeric values and doesn't give any issue when printing numeric values to the command window. However, when trying to display a symbolic equation, for example:
equation = (-66*cos( th1 + pi/2 ) - 0.99*x*cos( th1 + pi/2 ) + 0.99*y*sin( th1 + pi/2 )) / (cos( th1 + pi/2 )^2 + sin( th1 + pi/2 )^2 )
By simply using the disp(simplify(equation)) command, the following is printed to the Command Window:
-(222143115238362815690920839645245649785771639010720389686529839575*cos(th11 + pi/2) + 3291009114642412084309938365114701009965471731267159726697218048*x0*cos(th11 + pi/2) - 3291009114642412084309938365114750367196616874232894662022664290*y0*sin(th11 + pi/2))/(3291009114642412084309938365114750367196616874232894662022664290*(cos(th11 + pi/2)^2 + sin(th11 + pi/2)^2))
So, I tried using vpa(equation,2) to display the numerical values to 2 significant digits, the output is:
-(3.0e-64*(2.2e+65*cos(th11 + 1.6) + 3.3e+63*x0*cos(th11 + 1.6) - 3.3e+63*y0*sin(th11 + 1.6)))/(cos(th11 + 1.6)^2 + sin(th11 + 1.6)^2)
Is there a way to change the output format of the Command Window so that it shows the equation so that it is human reader friendly?

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Ameer Hamza
Ameer Hamza 2020-12-3
编辑：Ameer Hamza 2020-12-3

1 个投票

The format short only applies to native numeric datatypes, e.g., double. Generally, it is preferable to display symbolic calculation in full precision. However, you can change the default display of symbolic numbers using sympref()
sympref('FloatingPointOutput', 1)
It will change the preference of symbolic toolbox to display values as floating point numbers. To revert back, run
sympref('FloatingPointOutput', 0)

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