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
on 2 Dec 2014
Edited: MathWorks Support Team
on 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))
Accepted Answer
MathWorks Support Team
on 8 Jul 2020
Edited: MathWorks Support Team
on 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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