how to get struct array field as a vector and compare the two fields

I have a 1x960 struct array with 3 fields: "IM" , "trialtype", and "memorability"

how can I use the two field "IM" and "memorability" so I can compare them in a graph with "IM" on the x axis and "memorability" on the y

[Walter Roberson]

What are the data types of the fields, and what are the sizes of the individual entries?

[Nadiyah Browning]

What do you mean by what are the data types?

Like whether they are nominal or interval/ratio?

[Nadiyah Browning]

the fields are in a .mat file

[Walter Roberson]

Are they double()? Are they categorical? Are they durations? Are they transfer functions? Are they cell arrays of character vectors that represent dates?

[Nadiyah Browning]

and what do you mean bby sizes? "IM" stands for image (so they have indivdual random number ID names) and the memorability is the score that is a decimal

Answer 1

[Walter Roberson]

Under the assumption that IM and memorability are scalars for each entry, then

IM = [YourStructArray.IM];
memorability = [YourStructArray.memorability];

%as an outside observer I cannot assume that the IM entries are in sorted order
[~, idx] = sort(IM);
IM = IM(idx);
memorability = memorability(idx);

plot(IM, memorability)

[Nadiyah Browning]

IM is not scalar, for example the first image (IM) is named 588 the second is labeled (1987) those numbers are random and don't mean anything. How can I change the labels??

[Walter Roberson]

"scalar" means a 1 x 1 array, a single value. As compared to the possibility that an IM entry was, for example, a 48 x 64 x 3 RGB image.

If the numbers are random and don't mean anything, then putting them on the x axes needs to be reconsidered, as they provide no position information.

Perhaps what you want is for the memorability values to be plotted in the same order as the index into the array, but for the IM to be used as the label? If so and the IM are numeric, then

IM = [YourStructArray.IM];
memorability = [YourStructArray.memorability];
plot(memorability);
xticks(1:length(IM));
xticklabels(IM);

set(gca, 'XTickLabelRotation', 90);

setting the rotation to 90 is an attempt to deal with the fact that plotting 960 different arbitrary labels on one plot is not going to be readable on anything less than about a 9000 pixel wide display. If the labels turned out to be orderable without gaps (even if the order does not mean anything) then fewer tick labels could be used.