How to manipulate some data inside a structure array?

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Virgilio Grigiotti 2021-4-30

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评论： Mario Malic 2021-5-1

Hi all,

I have to calculate some areas from some different hydraulic cross section datasets, i think it won't be a problem with trapz function. With a help i managed to build a structure array "called" sections where there are all the cross sections as field and another substructure as a value with station and elevation data of the hydraulic cross section

When i try to calculate minimum elevation (inside a for cycle used to extract data from a .gxx file) i manage to see the loop with all the elevation data in the command window but in the workspace the variable is only the last value of the matlab calculation

The struct is written in this way: Sezioni.(sez_name).station = sez1(:,2)'

sez_name is composed by 191 "char" fields with name of the c.s., the value is another 1x1 structure with station (x) and elevation (y) data. I have to calculate the minimum elevation for all fields, not only for the last. How can I do? Thank you for the help.

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Mario Malic 2021-5-1

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Hey Virgilio,

When you ask for some inputs from structure, there are cases where the output will result in something like this

data = struct();
tempstruc = struct('a', [1; 2], 'b', [2; 3]);
data.a(1).station = tempstruc;
data.a(2).station = tempstruc;
data.b.station = [2 3 4;
                  1 4 5];
[data.a.station]
ans = 1×2 struct array with fields:
    a
    b
data.a.station
ans = struct with fields:
    a: [2×1 double]
    b: [2×1 double]
ans = struct with fields:
    a: [2×1 double]
    b: [2×1 double]

If you see the last line, this is how your output looks like, ans is being constantly replaced and your next line will only take the last value for it.

It is hard to visualize how is your structure formed. I'd suggest you to create a simpler and similar structure and try to figure out how you should do things on it.

Take a look also at functions fieldnames.

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