[?] Change x axis units from seconds to minutes?

Questions
,
1

Is there any way to overwrite the x-axis values in a plot?

I have numerical solution to a differential equation, the solution is plotted against time in seconds. However, I want to change the x-scale of my plot to show minutes, without having to go back and solve the differential equation again.

Plot[Evaluate[(((y[x]) /. solutionNum))], {x, 0, signalLength}, 
       PlotRange -> {{0, signalLength}, {All, All}}, 
       FrameLabel -> {"time / s", "temperature / ºC" }, PlotLegends -> {"Model"}];

I want to overwrite the x-axis values to show for instance 0-250 minutes, and not 0-15000 seconds, without having to redo my soluton .

Thanks in advance!

result.JPG
result.JPG1239×662 41 KB

2

Rescaling of your variable x:

Plot[Evaluate[(((y[60x]) /. solutionNum))], {x, 0, signalLength/60}, PlotRange -> {{0, signalLength}, {All, All}}, FrameLabel -> {"time / min", "temperature / ºC" }, PlotLegends -> {"Model"}];

would do the trick, without the data it is tricky to test..

3

If you are using the Quantity system, you should be able to use an option called TargetUnits.

4

Sara,

I like to use TimeSeries because you can shift and scale things later (if you need to compare real data, etc.).

Using the example from NDSolve:

s = NDSolve[{y'[x] == y[x] Cos[x + y[x]], y[0] == 1}, y, {x, 0, 30}][[1]]

The answer is in seconds so I construct a TimeSeries from it that has minute spacing:

ListLinePlot[TimeSeries[(y /. s)[Range[0, 30, .1]], {0, 30/60}], 
 PlotRange -> All]

to get:

plot.png
plot.png540×340 12.8 KB

5

Thanks a lot!

6

Thanks!

7

That will be really helpful for me also in other projects. Thanks a lot!