How to keep same time range when sending data form Simulink to Matlab?

hi, I am Simulating a model in simulink and want to plot a graph of the output in MatLAB, but when i send it to MatLAB the time range changes, for example, when its in Simulink, its 300 seconds but when sent to MatLAB its 1200 seconds, basically I want the same response from the scope only in MatLAB.

Thanks

Johnny

Answer 1

[Fangjun Jiang]

I suspect you are viewing partial of your curve in Simulink scope. See this post: http://www.mathworks.com/matlabcentral/answers/5591-scope-time-not-shown-to-full-simlation

You may have ploted your curve in Matlab without time so your x-axle is just number of data samples. By default, the simulation time is sent to the workspace as "tout", so try, plot(tout, YourVariable). You can change this by click menu:

Simulation-> Configuration parameters ... -> Data Import/Export

[Johnny]

I tried that, and it says that vectors must be same length, as for the data import/export nothing has changed. would it have anything to do with the solver in the configuration parameters? I have been doing this months now and can never seem to get my graphs right.

thanks

johnny.

[Kaustubha Govind]

I suspect that your variable is the output from a block that runs at a lower sample-rate than the base-rate of the model (the time-steps are logged in tout). In order to log the time-steps corresponding to your signal, you can save the signal as a "Structure with Time" format. You can either use the Data Import/Export pane as Fangjun suggested, or use the "To Workspace" block to log your signal to the MATLAB workspace as a "Structure with Time" Once you have done this, you should be able to use something like:

plot(YourVariable.time, YourVariable.signals.values)

[Johnny]

thanks very much guys, that was great help. its for my final year project so it needs to be perfect.

johnny

[papan dey]

i have generated simulink figure and can convert it in matlab using plot(signal) . now if i want to take the graph between a time limit such as 0.2s t0 0.5s, which command should i write?