How to set the fields simultaneously in a large structure array in Matlab?

Question

I have a large structure array.

I would like to perform a sensitivity analysis on a function that processes this array.

So, say my structure array has name 's', 10,000 elements, and field names 'x' and 'y'.

I'd like to do the following:

xs = [s(:).x];
xs = xs + 5*randn(size(xs));
s(:).x = xs;

Sadly, the last step is not valid matlab. Any thoughts? Was hoping to avoid a loop.

Please refer to: Updating one field in every element of a Matlab struct array — p8me
– p8me, Commented May 23, 2013 at 23:09
I suspect the problem is that even if Matlab could handle an expression like that, it's not clear whether each array element s(i).x should contain the entirety of xs or just a single element from xs — Ryan J. Smith
– Ryan J. Smith, Commented May 23, 2013 at 23:17

Community · Accepted Answer · 2017-05-23 12:05:24Z

0

From this answer and after playing around with deal. I think I have what you are looking for but it requires converting xs into a cell array using num2cell:

xs_cell = num2cell(xs); % convert matrix to cell array.
[S(:).X]=xs_cell{:}; % update the values in the field X

edited May 23, 2017 at 12:05

CommunityBot

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answered May 23, 2013 at 23:20

Azim J

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