How to call data from a structure array?

Hi, I need help.

I need to get these results [using the calls: experiments, experiments(2), and experiments(1).height]:

>> experiments

experiments =

1x2 struct array with fields:

num

code

weights

height

>> experiments(2)

ans =

num: 11

code = ‘t’

weights: [111.4500 111.1100]

height: [1x1 struct]

>> experiments(1).height

ans =

feet: 5

inches: 6

I have this code, but I really don't know how to call and display the results above, because using the calls just lead to errors. What must be missing in my code?

experiments(1).num = 33;
experiments(1).code = 'x';
experiments(1).weights.1 = 200.34;
experiments(1).weights.2 = 202.45;
experiments(1).height.feet = 5;
experiments(1).height.inches = 6;

experiments(2).num = 11;
experiments(2).code = 't';
experiments(2).weights.1 = 111.45;
experiments(2).weights.2 = 111.11;
experiments(2).height.feet = 7;
experiments(2).height.inches = 2;

I also tried this kind of arrangement/code...

experiments(1) = struct('num',33,'code','x','weights',struct('1',200.34,'2',202.45),'height',struct('feet',5,'inches',6))
experiments(2) = struct('num',11,'code','t','weights',struct('1',111.45,'2',111.11),'height',struct('feet',7,'inches',2))

Your assistance will be greatly appreciated. Thanks in advance!

Answer 1

[Arthur Roué]

You cannot name a field with just numbers

% This is not a correct syntax
experiments(2).weights.1 = 111.45;
experiments(2).weights.2 = 111.11;

Fields, like variables in MATLAB, must start with a letter.

experiments(2).weights.W1 = 111.45;
experiments(2).weights.W2 = 111.11;

[Roxanne Esguerra]

Oh, thank you. But will that correspond to this,

[Roxanne Esguerra]

And what should I do with calling the functions to get those results? Thanks!

[Arthur Roué]

You have a strcuture-array experiments with 2 elements.

In this structure fields weights and height are also strcuture with respective fields W1, W2 (1 and 2 are not correct field names) and feet, inches. so yes !

[Arthur Roué]

You access the value in a structure same way you create it with dot indexing.

experiments(2).height.feet
>> 7

[Roxanne Esguerra]

Thank you so much. But one more thing, when I try to call >>experiments, it results to nothing. However I must get this,

experiments =

1x2 struct array with fields:

num

code

weights

height

[Arthur Roué]

experiments is a structure and not a function.

When you write

experiments

in the command windows, it displays the content of experiments. As experiments is a strcture with 2 element, it only displays its fields.

Use functions disp or fprintf(1, 'my str') to display a field value in the command window

[Roxanne Esguerra]

Thanks! I've figured it out. The script must be run first before typing the needed commands. Thank you so much :)