How to take out units in a column

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EB
EB 2020-4-17
评论： Ameer Hamza 2020-4-18
I am trying to do a 3D plot where I would plot the x and y coordinates over time, but when I try to use the plot3 command, it says all of the data needs to be numeric values.
Therefore, I am trying to take out the 'sec' shown in the first column when I import my data, but am having no luck.
I tried using
>> sscanf(data, '%f')
Error Message: First argument must be a string scalar or character vector.
I tried
>> num2str(data)
Error Message: Input to num2str must be numeric.
and I tried a few other ones which I realize wasn't even going to do what I expect it to do.
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Ameer Hamza
Ameer Hamza 2020-4-17
The column 1 have class of 'duration'. See my answer to convert them to double datatype.

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Ameer Hamza
Ameer Hamza 2020-4-17
out.time = seconds(out.time);

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