How can I fix Iapp?

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Sonuncu Saniye
Sonuncu Saniye 2017-12-5
回答： Elizabeth Reese 2017-12-7
dt=0.002;
N=2;
simstart=10;
simfinish=20;
period=simfinish-simstart;
Io=10;
Iapp = zeros(N,simstart/dt);
Iapp = [Iapp Io*ones(N,1+((period/dt)))];
Iapp = [Iapp zeros(N,(tmax-simfinish)/dt)]
When I set simstart=0.2 and simfinish=0.8 I get the following error: "Error using ones, size inputs must be integers." Thank you for your help!!

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Elizabeth Reese
Elizabeth Reese 2017-12-7
This is a floating point issue. You can see this by typing
format long
in the MATLAB Command Window and displaying all of the values you compute in each step. The numbers period and dt look exact but are not, and their division is not exactly 300. This is because some real values are not represented as floating point numbers, so computers round those computations to the nearest floating point number. You can use the round function to ensure that the input to ones is an integer.

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