How to load a specific element of a variable?

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Paola
Paola 2018-2-6
回答： Walter Roberson 2018-2-6
Hello,
I have a file "Positions.mat" which contains 4 variables: a, b, c, d. Every variable is a 1x2 double.
For example:
a= 1 0.064293
b= 2 0.563890
c= 2 2.475530
d= 1 1.473709
If I load a variable I do
X= load('Positions.mat','a');
But how can I load only the second column of 'a'?
Thank you

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回答（1 个）

Walter Roberson
Walter Roberson 2018-2-6
If you save with the -v7.3 flag then you can do this using matFile()
I would suggest that this is much less efficient than regular access for small to moderate arrays.

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