How to load a specific element of a variable?

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

Answer 1

[Walter Roberson]

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.