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Index exceeds array dimensions when inputting time = 0

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JACOB SHELDRAKE
JACOB SHELDRAKE 2020-4-30
评论： Ameer Hamza 2020-5-1
I don't understand why I get this error, what does it mean that my array range is [1-1]?
Warning:Discontinuities detected within algebraic loop(s), may have trouble solving
Error:An error occurred while running the simulation and the simulation was terminated
Caused by:
Index exceeds array dimensions. Index value 0 exceeds valid range [1-1] of array u.
Error in 'DCDC/Pbase' (line 3)
y = u(1-exp(-t/0.001));
  1 个评论
Sindar
Sindar 2020-4-30
What is 'u'? Matlab seems to think it is a 1x1 array (with a valid range of indices from 1 to 1). So, if you pass [1-exp(-t/0.001) = 0] to it, you are trying to access the zeroth element, which does not exist

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Ameer Hamza
Ameer Hamza 2020-4-30
From the description of the error message, it appears that you are trying to solve an ODE in Simulink. In that case, my guess is that you are trying to multiply u with the exponential term. Correct it like this
y = u*(1-exp(-t/0.001));
On the off-chance that 'u' is the unit step function, you can use heaviside function(): https://www.mathworks.com/help/releases/R2020a/symbolic/heaviside.html

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