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Read in json file as three dimensional array

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Benedikt Krauß
Benedikt Krauß 2020-11-11
评论： Nitesh Panchal 2021-4-26
Hello,
I have trouble with Matlab and reading data from JSON files. I basically have one .json file which looks like this:
{
"Data": {
"1": [
0.0,
0.1,
0.2,
0.3,
0.4,
0.5,
0.6,
0.7,
0.8,
0.9,
1.0
],
"2": [
3.1517,
3.4879332128,
3.551222604,
3.5870886304,
3.6319243674,
3.6911242439,
3.7654878049,
3.8551335026,
3.960078832,
4.0803263235,
4.2158762895
],
"3": [
3.4262,
3.5204004756,
3.5719092392,
3.6113550565,
3.6542077094,
3.7082794455,
3.777514335,
3.8639024635,
3.9684468861,
4.0916520841,
4.2337707085
]
}
}
Then in my Matlab code I try to read this data with:
fname = 'test.json';
fid = fopen(fname);
raw = fread(fid,inf);
str = char(raw');
fclose(fid);
jsonData = jsondecode(str);
Sadly all the data is then in a single dimensional array but I would need each data tab as one array, so that later on I can use it as "jsonData.("1")".
Where is the error in my code? Still at the beginning of using Matlab as you can probably guess my looking at my question.

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回答（1 个）

Eshaan Shah
Eshaan Shah 2020-11-11
编辑：Eshaan Shah 2020-11-11
Hi,
I executed the following code in MATLAB 19b and it seems to work as expected.
fname = 'test.json';
fid = fopen(fname);
raw = fread(fid,inf);
str = char(raw');
fclose(fid);
jsonData = jsondecode(str);
Below is the content of jsonData:
>> jsonData
jsonData =
struct with fields:
Data: [1×1 struct]
>> jsonData.Data
ans =
struct with fields:
x1: [11×1 double]
x2: [11×1 double]
x3: [11×1 double]
In order to correctly access the individual arrays, you can execute
jsonData.Data.x1
jsonData.Data.x2
jsonData.Data.x3
Note: I see the same behavior in 19a, 19b, 20a, and 20b.
  1 个评论
Nitesh Panchal
Nitesh Panchal 2021-4-26
>> fname = 'test.m';
>> fid = fopen(fname);
>> raw = fread(fid,inf);
>> str = char(raw');
>> fclose(fid);
>> jsonData = jsondecode(str);
>> jsonData
jsonData =
struct with fields:
Data: [1×1 struct]
>> jsonData.Data
ans =
struct with fields:
x1: [11×1 double]
x2: [11×1 double]
x3: [11×1 double]
>> jsonData.Data,x1
ans =
struct with fields:
x1: [11×1 double]
x2: [11×1 double]
x3: [11×1 double]
Undefined function or variable 'x1'.
>> jsonData.Data.x1
ans =
0
0.1000
0.2000
0.3000
0.4000
0.5000
0.6000
0.7000
0.8000
0.9000
1.0000
>>

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