Converting a 2d vector to a 4d vector
3 views (last 30 days)
Show older comments
In a machine learning task, I need a 4d single type data to fed for training. But my data is in a 2d format. Would you please show me how to do this conversion.
Input:
for data of 28th row,
val(28,1)=1.5
val(28,2)=2.7
output:
val(:,:,1,28)=1.5
val(:,:,2,28)=2.7
I m looking for your advice in this regard.
Thanks,
0 Comments
Accepted Answer
ANKUR KUMAR
on 25 Feb 2019
Let's take a random data A
A=randi(10,30,2);
Use permute to change into 4D
B=permute(A,[3,4,2,1]);
Now, B(:,:,2,24) and A(24,2) are same.
>> B(:,:,2,24)==A(24,2)
ans =
logical
1
3 Comments
ANKUR KUMAR
on 25 Feb 2019
Edited: ANKUR KUMAR
on 25 Feb 2019
First input of permute is the data itself.
Second input is in the row matrix which contains the sequence of dimension you wish to put it.
For example, in B, we have stored first the fourth dimension, then the thrid dimension, followed by second and first.
If we write,
B=permute(A,[3,4,1,2]);
then
>> B(:,:,24,2)==A(24,2)
ans =
logical
1
SIMPLE EXAMPLE
>> A=magic(5)
A =
17 24 1 8 15
23 5 7 14 16
4 6 13 20 22
10 12 19 21 3
11 18 25 2 9
>> permute (A,[2,1])
ans =
17 23 4 10 11
24 5 6 12 18
1 7 13 19 25
8 14 20 21 2
15 16 22 3 9
Permute simply changes the dimension as per your input in purmute command.
More Answers (1)
See Also
Categories
Find more on Dimensionality Reduction and Feature Extraction in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!