How to work with Struct With Struct construction

Hello.

I converted json.data to string and converted string to struct using jsondecode. Got the next struct like:

data = 

  struct with fields:

          A1: [1×1 struct]
          A2: [1×1 struct]
          A3: [1×1 struct]
          A4: [1×1 struct]
          A5: [1×1 struct]
          A6: [1×1 struct]

How to work with this construction, I mean let's say i need data from A1: [1x1 struct] (this structure contains the name of the variables and its value). How can I get it?

And can I convert this construction to massive with A1 ... A2 - rows and data from [1x1 struct] - columns?

Answer 1

[Jan]

It is not clear, how the inputs data exactly look and what you want as output. Prefer to post some code, which produces both.

Maybe you want:

C = struct2cell(data);
Result = cat(1, C{:});

[Ivan Ivan]

data looks like

{    "A1": {        "1_par": val",        "2_par": "val",        "3_par": "val"    },    "A2": {        "1_par": val",        "2_par": "val",        "3_par": "val"    }}

and some parameters contain another paramets like:

"n_par": {            "n1_par": "val",            "n2_par": "val",            "n3_par": "val",            "n4_par": "val",            "n5_par": [                "val",                "val",                "val"            ]        }

completely looks like:

{    "A1": {        "1_par": val",        "2_par": "val",        "3_par": val",        "4_par": {            "41_par": "val",            "42_par": "val",            "43_par": "val",            "44_par": "val",            "45_par": [                "val",                "val",                "val"            ]        }    },    "A2": {        "1_par": val",        "2_par": "val",        "3_par": "val"    "4_par": {            "41_par": "val",            "42_par": "val",            "43_par": "val",            "44_par": "val",            "45_par": [                "val",                "val",                "val"            ]        }      }}

code:

fileName = 'data.json'; % filename in JSON extension
fid = fopen(fileName); % Opening the file
raw = fread(fid,inf); % Reading the contents
str = char(raw'); % Transformation
fclose(fid); % Closing the file
data = jsondecode(str)% Using the jsondecode function to parse JSON from string

I got struct with struct, but I don't know how to work with this

[Walter Roberson]

In that case, the answer to your question is NO, you cannot convert it into having the A* variables be rows and the values be columns -- not unless you make it a cell array. You have entries of different sizes. You have only 3 variables for A2, but you have 5 variables for your second example and one of those variables is a vector instead of a scalar. If you want an array that is not a cell array, everything has to be consistent.

[Jan]

I cannot run the code, because the input is not complete. Therefore I cannot guess, how your data looks like. I do not understand what "get struct with struct" means also.

[Ivan Ivan]

data, but I cant download json file

Code:

function parsing()
fileName = 'data.txt'; % filename in JSON extension
fid = fopen(fileName); % Opening the file
raw = fread(fid,inf); % Reading the contents
str = char(raw'); % Transformation
fclose(fid); % Closing the file
data = jsondecode(str)% Using the jsondecode function to parse JSON from string
end

[Ivan Ivan]

Guys, than you. I figured out this problem

Answer 2

[Walter Roberson]

names =  structfun(@(S) S.Name, Data);
values = structfun(@(S) S.Value, Data, 'uniform', 0);
catval = cell2mat(values(:).')

[Ivan Ivan]

Didn't work. Error:

Error using structfun
Inputs to STRUCTFUN must be scalar structures.

Can you explain your code pls