
#1
Apr2211, 03:35 PM

P: 26

1. The problem statement, all variables and given/known data
I am very confused over how matlab knows which variables are changeable variables in ode45. 2. Relevant equations // 3. The attempt at a solution My input is p Earlier have defined; a = 1; k = 1; w = 1/3; Then I want to figure out adot and adoubledot from these. adot = (a)*(p  k/a)^(1/2); adoubledot = (a/2)*(p + 3*w*p); Suddenly realised that I have no idea why matlab would let "a" change but not let "p" and "k" change... Is there a way to tell matlab that one of the variables is changing in time and the others aren't? 



#2
Apr2311, 07:19 AM

P: 26

Nobody? =( Does my question make sense?



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