Change x-values in gnuplot

Question

I'm plotting a column of data which represents a time series in gnuplot. Every value represents a time value after 500 iterations / time units. Can I tell gnuplot to multiply the x-values it displays by 500?

I thought this would be a standard problem since every time one has to plot a time series one needs to tell the plotting program what time unit each iteration has.

I don't want to create an extra column with x-values manually, since I have a lot of different data of different length. I don't want to create a x column for everyone of them.

Christoph · Accepted Answer · 2015-09-14 09:08:17Z

6

If you have only a single column, gnuplot uses the row number as x value. This can be accessed by the pseudo column 0 and scaled like

plot 'datafile' using ($0*500):1

or equivalently, if you're calling this from a shell script

plot 'datafile' using (column(0)*500):1

edited Sep 14, 2015 at 9:08

answered Sep 11, 2015 at 15:28

Christoph

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6 Comments

mcExchange Over a year ago

As I said, I unfortunately don't have a x column. I have only a y-column representing the y-values in a time series. The temporal spacing between every y-value is the same.

mcExchange Over a year ago

Still no luck. I'm using a plotting script (bash-script) which is why $0 is interpreted as the first command line argument.

Christoph Over a year ago

How should I know? You haven't mentioned this with a single word... Then use column(0)*500.

mcExchange Over a year ago

Sorry for that. I didn't think of that in the beginning. It works now. Thanks a lot

Jonatan Öström Over a year ago

Or \$0 instead of column(0)

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