"matfile" function does not fetch variables with multiple fields?

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I have a very big mat file(about 2 GB),in which there are several hierarchical relationships, there is an array of variables occupy a lot of memory, such as matObj.field.sub1.sub2.var, in the "var" occupies a lot of space, it is not convenient to import into matlab at once, so I use the matfile function to parse, size function to determine the size of var, I tried to use size( matObj,'field.sub1.sub2.var') to judge, but it will report an error, field.sub1.sub2.var is not a variable of matObj. How can I solve the problem efficiently? I'd appreciate your answer!

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Walter Roberson
Walter Roberson 2022년 5월 30일
You cannot. Only entire variables can be inquired about. You would have to load the variable to determine the size of the field.
I suggest that you store the sizes into a variable at the time you write the data into the file.
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cui 2022년 5월 30일
Not the best way, but thanks for your answer.

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