Why does the "simple" function in the Symbolic Math Toolbox cause MATLAB to hang when trying to simplify my expression?
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MathWorks Support Team
am 2 Dez. 2014
Bearbeitet: MathWorks Support Team
am 12 Aug. 2020
I have created the following expression using symbolic variables:
>> syms x y z a b c iu iv su sv;
>> x_hat = cos(iv)*( cos(su)*sin(sv)*z - sin(su)*sin(sv)*y + cos(sv)*x +a ) ...
- sin(iv)*( cos(su)*cos(sv)*z - sin(su)*cos(sv)*y - sin(sv)*x +b ) ;
>> y_hat = cos(iu)*( sin(su)*z + cos(su)*y + c ) ...
- sin(iu)*sin(iv)*( cos(su)*sin(sv)*z - sin(su)*sin(sv)*y - cos(sv)*x +b ) ...
- sin(iu)*cos(iv)*( cos(su)*cos(sv)*z - sin(su)*cos(sv)*y - sin(sv)*x +a ) ;
When I try to simplify this expression with the "simple" function, it produces a lot of output to the Command Window, but remains 'Busy' and does not yield a simplified expression. How can I fix this?
>> simple(diff(atan( x_hat / y_hat ),x))
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MathWorks Support Team
am 8 Jul. 2020
Bearbeitet: MathWorks Support Team
am 12 Aug. 2020
The use of 'simple' function is no longer supported. Instead, you should use the "simplify" function, which works much faster on this example and does yield a simplified form of the expression.
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