How do I assign multiple variables the array data from multiple rows in a field

I am new to MATLAB programming and am having trouble even asking the right question. I am trying to assign 6 variables the array data from 6 vertical cells (rows), from a field called "analysis.opt_history.error". When I type this:

A = analysis.opt_history.error

I get the array from the first row (this is OK):

A =

1.068 0.749 0.749 0.737 0.737

However, I also want to retrieve the array data that is in Rows 2 through 6 and assign the values of each cell to B, C, D, E, F separately. I cannot figure out how to do this despite much time reading the community. Thanks!

Mark

Answer 1

[Matt J]

Is this what you mean?

data={1,2,3,4,5,6}'

data = 6×1 cell array
    {[1]}
    {[2]}
    {[3]}
    {[4]}
    {[5]}
    {[6]}

[A,B,C,D,E,F]=deal(data{:})

A = 1

B = 2

C = 3

D = 4

E = 5

F = 6

[Mark Sloan]

Yes, this is what I am trying to do, but when I applied it to my data it still did not work. I've attached a screenshot of the workspace structure I am trying to get the data from and put into the 6 variables (Field = "error" with 6 rows). This is what I typed in:

[A,B,C,D,E,F]=deal(analysis.opt_history.error{:})

This is MATLAB's response:

"Expected one output from a curly brace or dot indexing expression, but there were 6 results."

From the attached screenshot, here is what I am trying to get (this defines success):

A = 1.0680 0.7429 0.7429 0.7429 0.7429 0.7429 0.7371 0.7371

B = 0.7910 0.7462 0.7462 0.7462 0.7462 0.7462 0.7428 0.7428

C = 1.5977 0.8013 0.8013 0.8013 0.7783 0.7783 0.7783 0.7783 0.7761

D = 4th row array

E = 5th row array

F = 6th row array

Thank you for your quick response!

Mark

[Matt J]

Just do,

[A,B,C,D,E,F]=deal(analysis.opt_history.error)

[Stephen23]

The field ERROR has no cell arrays, so the curly-brace indexing is a red-herring**. In fact, there are no cell arrays anywhere in the data shown in your screenshot, unlike what you explained in your question.

All you need is the dot-indexing to refer to the ERROR field:

[A,B,C,D,E,F] = deal(analysis.opt_history.error)

** as well as being syntatically incorrect when appended after a comma-separated list:

https://www.mathworks.com/matlabcentral/answers/1656435-tutorial-comma-separated-lists-and-how-to-use-them

[Mark Sloan]

That works! Thank you so much for your quick help! I'll need to study cell arrays (and what is not a cell array). Many thanks!

[Matt J]

@Mark Sloan You're welcome, but please Accept-click the answer to indicate that it worked.