Possibility to access/use whole structures

Hi!

I made a structure with;

month(1)
month(2)
month(3) etc.

For example, I want to plot month(1:12).Q how can I do this?

Answer 1

[Guillaume]

See Access multiple elements of a nonscalar struct array. In your case, assuming that the fields Q are scalar:

plot([month(1:12).Q])

[loes7815]

Matlab returns 'vectors must be the same length', so I guess because januari is 31 days and februari 28, thats the problem. How can i solve this? But I also want to plot all Q against another variable. for example

plot([month(1:12).Q],[month(1:12).Z])

and this doesnt work either.

The link doesnt work? I have to enter my licensenumber, but this does not give me access to the page.

[Stephen23]

Try this link, it does not need a license:

http://www.mathworks.com/help/matlab/matlab_prog/access-multiple-elements-of-a-nonscalar-struct-array.html

Accessing the elements of a non-scalar structure is easy. Merging unequal-length vectors into one array is not so easy, and essentially the best solution is to preallocate an array and use a loop.

[Guillaume]

It wasn't clear from your question whether Q was scalar (in which case you'd want a single plot for all the months) or a vector (in which case you'd want a plot per month).

In the latter case, the easiest is probably:

figure;
hold on;
arrayfun(@(m) plot(m.Q, m.Z), month);

Another option is to stuff the Q and Z in a single cell array and use comma separated list expansion to input arguments:

figure;
QZ = {month.Q; month.Z};
plot(QZ{:}); %Q and Z of each month must be the same size (or scalar)