I am attempting to evaluate a ground motion data set using Newmark's method. The programing routine augments displacement, velocity, and acceleration. I then need to plot the displacements vs. the time period as it varies from 0.02 to 4 in steps of 0.02. When I define T I get the following error :
I don't think a local definition with in the routine will yield accurate results. The routine needs to run as a function of T.
ACCEPTED SOLUTION
Accepted Solutions
Sorry, don't know anything about Newmark method and what its all about.
But I don't think that your function (first version) needs a vector T at all.
T seems to be the time period you should known, isn't it?
For every value of T you get a full set of displacement, velocity and acc vectors.
If you just want to use the max value of them so that every value of T returns just one value u,v, and a, that should be no problem.
No idea if this makes any sense
Prime 9 file attached
You need to apply vectorization (arrow over the expression) when you call NNONR with T as a vector.
But the result will be a vector with 200 elements corresponding to the 200 values in T and each of these elements would be a 3000 x 3 matrix (the augmented vectors u, v and a corresponding to the specific value in T.
You would get the very same nested matrix by looping through T and calling NNONR for every value of T (which actually is what vectorization does)
So I am not sure what you would like to plot ...
At least the last value in your vector Accn is a NaN. You may filter for them:
I still don't know what you are trying to plot as with the function you wrote you would get 3000 displacement values for every single time T. So which one would you like to plot over time?
If its the last one of all this values you could do it that way
Not sure if this would make any sense, though.
This is what the code attempts to follow after being modified for the inputs from the data file:
I wrote this in routine format but ran into issues with for loops so reverted back to the recently uploaded version.
Sorry, don't know anything about Newmark method and what its all about.
But I don't think that your function (first version) needs a vector T at all.
T seems to be the time period you should known, isn't it?
For every value of T you get a full set of displacement, velocity and acc vectors.
If you just want to use the max value of them so that every value of T returns just one value u,v, and a, that should be no problem.
No idea if this makes any sense
Prime 9 file attached
