Compute trig. function in symbolic matrix
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Hi,
I have a symbolic matrix (as shown below). I would like for matlab to compute the trig functions with non-th5 values. How do I go about this.
Thanks in advance.
[ cos(th5), -sin(th5), 0, 0]
[ cos(90)*sin(th5), cos(90)*cos(th5), -sin(90), 0]
[ sin(90)*sin(th5), sin(90)*cos(th5), cos(90), 0]
[ 0, 0, 0, 1]
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Walter Roberson
2015년 10월 30일
Are you referring to reducing the sin(90) and cos(90) to the corresponding constant values? Because if you are then you need to take into account that sin() and cos() operate in radians, not in degrees. But this is your purpose then vpa() the symbolic matrix.
If you are wanting to substitute a numeric value for th5 then use subs(), possibly in conjunction with vpa() or double()
subs(TheMatrix, th5, 1.238343) %put in a particular numeric value
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Walter Roberson
2015년 10월 30일
You can call sind() or cosd() in a symbolic expression, provided it is at the MATLAB level (not in a string that has been passed to solve() or the like.)
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