Custom Flight Log - change datatype

Question

Antoine Dilly 2021-2-23

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评论： Antoine Dilly 2021-2-25

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i have one problem with the "Custom Flight Log" example.

https://www.mathworks.com/help/uav/ug/visualize-custom-flight-log.html

after loading the data from a file:

Data = load('xxx.mat');
logData = Data;
Plotter = flightLogSignalMapping;

I need to make the timeAccess function. But inside my Data struct is a time array from the type double (The data is saved as milliseconds)

timeAccess = @(x)x.time;

How can i change the double type to milliseconds type ?

The problem is the data is should not be changed, because it has the right structure (0.0083).

And the fuction:

MS = milliseconds(X)

would change the data.

So how i change only the format to milliseconds ?

i am happy for any help

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Answer 1

Jianxin Sun 2021-2-23

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Hi Antoine,

Is your data X == 0.0083 seconds or 0.0083 milliseconds? If it is the former, you can use

timeAccess = @(x)seconds(x.time);

The custom flight log expects a duration type from timeAccess return and the function above converts double type to a duration, such as 0.0083 seconds (8.3 ms).

Thanks,

Jianxin.

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Answer 2

Antoine Dilly 2021-2-23

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Thanks for the fast respond

This was also my first idea:

timeAccess = @(x)seconds(x.time);

But i get some error then i run my code:

Data = load('xxx.mat');
logData = Data;
Plotter = flightLogSignalMapping;
timeAccess = @(x)seconds(x.time);
GPS = @(x)[x.lat,x.lon,x.alt];
mapSignal(Plotter, "GPS", timeAccess, GPS);
predefinedPlots = show(Plotter,logData,"PlotsToShow","Compass");

Error using array2timetable (line 86)
The VariableNames property must contain one name for each variable in the table.
Error in uav.internal.log.Analyzer/extract (line 155)
                tbls{idx} = array2timetable(v(timeFilter,:), 'RowTimes',
                t(timeFilter), ...
Error in uav.internal.log.Analyzer/show (line 177)
                        signal = obj.extract(source, matchedSignalNames{sIdx}, ts,
                        te);
Error in flightLogSignalMapping/show (line 318)
            handles = obj.Analyzer.show(data, ts, te, plotsToShow);
Error in VisualizeCustomFlightLog (line 12)
predefinedPlots = show(Plotter,logData,"PlotsToShow","Compass");