substituting values from constant matrix to matrix containing variables
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I am trying to substituting values from constant matrix to matrix containing variables in the equatinon
now 'dJ' is my matrix with variables {sina,cosb,tanc,cotd}
z_old is column matrix has values for {a,b,c,d} in dJ and every time the value changes
z_old = [1 2 3 4]' %initial values of states
while 1
z_new = z_old - s*dJ;
z_old=z_new;
end
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回答(1 个)
Walter Roberson
2013-11-23
Providing that you are using the symbolic toolbox, see subs()
T = num2cell(z_old);
subs(Dj, {sina, cosb, tanc, cotd}, T)
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iamShreyans
2019-9-13
Hi, I have a similar problem but your solution doesn't seem to work for me
I have a matrix t = [t1 t2 t3-90], where t1, t2 and t3 are syms variable.
I wish to set all t's to zero value and for this I wrote:
subs(t,{t1, t2, t3},{0, 0, 0})
But the 't' matrix still has the old values. I expected it to change to [0 0 -90] but it didn't happen.
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