Plot large files with timestamp
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I have a large file and try to load it into MATLAB and plot it with timestamp.
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Walter Roberson
2018-11-21
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strcat the first two columns together with a blank between . datetime the result with an InputFormat parameter , which is required for this purpose because datetime cannot figure out fractions of a second by itself .
Now that you have timestamps and values you can prepare to plot . I think your release permitted using datetime as the X axis .
2 个评论
Walter Roberson
2018-11-21
That is more work. Time of day without an attached date is handled by duration objects. In your R2016b release, duration() did not support input as time strings, so to construct the objects it would be necessary to parse the character strings into arrays of numeric values that can then be passed to duration() . It is easier to
dt = datetime( strcat(testdata{:,1}, {' '}, testdata{:,2}), 'inputformat', 'yyyy-MM-dd HH:mm:ss.SSSSSS');
You can always convert those to duration afterwards:
dur = dt - dateshift(dt(1), 'start', 'day');
After which you can plot, such as
plot(dur, testdata{:,3:4})
Walter Roberson
2018-11-21
Like you posted,
testdata = read(ds);
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2018-11-21
2025-1-6
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