How do I plot data from a structure with time?

I have a structure with time from my scope in Simulink sent back to Matlab. I am unsure of what script code to use in Matlab to plot the data against time as I see it in the scopes in Simulink.

The structure is called Control_Logic

The signals area as follows.

How do I plot each individual signal vs time? Thanks Kieran

[Walter Roberson]

Could you show us

fieldnames(Control_Logic.signals)

and also if you could drag the divider between "values" and "dimensions" further right on the information, then you should be able to see the full information about the size of the first field; we can see it is 108350 by something but we cannot see what at the moment.

[Kieran Reeves]

Hi Walter

>> fieldnames(Control_Logic.signals)

ans =

    'values'
    'dimensions'
    'label'
    'title'
    'plotStyle'

Which appear to just be the column titles

Kieran

Answer 1

[Guillaume]

Most likely, this will work:

plot(Control_Logic.time, [Control_Logic.signals.values])

The [Control_Logic.signals.values] concatenates the values field of the 3 signal structures together into a 108350 x 3 matrix (assuming that values is 108350 x 1).

[Kieran Reeves]

Thanks Guillaume, but that plots all the signals on one graph. Ideally I would like to see Fields 1, 2 and 3 on separate plots

Kieran

[Guillaume]

subplot(2, 2, 1); plot(Control_Logic.time, Control_Logic.signals(1).values);
subplot(2, 2, 2); plot(Control_Logic.time, Control_Logic.signals(2).values);
subplot(2, 2, 3); plot(Control_Logic.time, Control_Logic.signals(3).values);

is one way to do it.

[Kieran Reeves]

Thank you so much.

Answer 2

[Lars Lindner]

Hi everybody, I have the exact same problem. Trying the command

plot(data.time, data.signals(1).values)

gives me the error shown in following image:

Does anybody has an idea, what I am doing wrong?

Thanks everybody and with nice greetings, Lars

[LUIS ANGEL OLVERA OLVERA]

Hi,

You have an issue using singleton dimensions, please review "squeeze"

squeeze Remove singleton dimensions.

B = squeeze(A) returns an array B with the same elements as

A but with all the singleton dimensions removed. A singleton

is a dimension such that size(A,dim)==1. 2-D arrays are

unaffected by squeeze so that row vectors remain rows.

NewArray=squeeze(data.signals(1).values)

This function will turn your initially (1,1,10161) structure to a new (10161,1) array which can be used with your time array

To graph:

plot(data.time, A)

I hope this is useful for your project!

Luis Olvera