error while using "from file" block in SIMULINK

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Harish Balaga 2011-6-9

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i am using "from file" block in simulink. the time stamp in the file starts from 0 and ends at0.2 sec(nondecreasing). but simulink is showing the follwing error.

"Time values must be monotonically non-decreasing." what should i do? if i use some other similar file, this problem is not there.

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Answer 1

Andreas Goser 2011-6-9

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在 MATLAB Online 中打开

In case this is a very individual issue, I suggest contacting Technical Support and provide your files.

I have one suggestion for troubleshooting. Load your file into the MATLAB workspace and then test your time variable (assuming t)

t=[1 2 3 4 6 5 7 8] % test data with an artifical issue
[test, ix]=find(diff(t)<0)

ix return a position were the data is nondecreasing

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Harish Balaga 2011-6-9

i tried it and the result is an empty matrix :-(

Andreas Goser 2011-6-9

I would expect that an empty time vector is seen as nonincreasing. The root cause may be a very differnt one then. WHY is the time variable empty?

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Answer 2

Arnaud Miege 2011-6-9

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As Andreas suggest, load your MAT file in MATLAB and re-order the data so that the time values are monotonically increasing. You'll probably find that sortrows is useful for that. Once you have re-ordered your data, save it to a different MAT file and use that file with the From File block.

HTH,

Arnaud