Creating a variable referencing specific cells from a cell variable with 30 structures?

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JM 2018-4-2

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https://ww2.mathworks.cn/matlabcentral/answers/392177-creating-a-variable-referencing-specific-cells-from-a-cell-variable-with-30-structures

编辑： Stephen23 2018-4-2

I have a variable that I converted to a cell. This variable is a 1x30 cell with 30 structures within it. (I had multiple levels) Each structure is a set of data (3000x20).

I want to create a new variable that contains that 3000th row, 1st column from each of those structures (3000,1).

I've tried X = Variable30Structures {:,1}{3000,1} However I get a message "matlab Expected one output from a curly brace or dot indexing expression, but there were 30"

I'm sure there is a simple way to do this, but I'm stuck as I've never tried this before.

Any help would be appreciated! Thank you

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Stephen23 2018-4-2

编辑：Stephen23 2018-4-2

You write that "This variable is a 1x30 cell with 30 structures within it", but then your example does not refer to any structure field: is this an actual MATLAB structure, or are you using the word "structure" just to describe "some organization of data" ? If it really is a structure, what fieldname is required to access that data?

"I have a variable that I converted to a cell"

Why? What form did the data have beforehand?

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