Read in json file as three dimensional array
20 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
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.
0 commentaires
Réponses (1)
Eshaan Shah
le 11 Nov 2020
Modifié(e) : Eshaan Shah
le 11 Nov 2020
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 commentaire
Nitesh Panchal
le 26 Avr 2021
>> 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
>>
Voir également
Catégories
En savoir plus sur JSON Format dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!