meaning of the notation of accessing the elements of the 2D matrix using 4 subscripts?
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Recently, I saw that some people use four sub-scripts to access the elements of a 2D matrix! For eg,If A=[1,2,3,4 ; 5,6,7,8 ; 9,10,11,12 ; 13,14,15,16], then the command, A(1,2,1,1) yields me an answer of 2.
How? What's the meaning of this command? Thanks in advance!!
2 Kommentare
Jan
am 20 Jun. 2018
Writing A(1,2,1,1) is valid, but simply confusing and misleading for the reader.
Stephen23
am 20 Jun. 2018
"How? What's the meaning of this command?"
All arrays implicitly have infinite trailing singleton dimensions. You can easily check this yourself:
>> size(A,3)
ans = 1
>> size(A,4)
ans = 1
>> size(A,99)
ans = 1
>> size(A,999)
ans = 1
>> size(A,9999)
ans = 1
Antworten (1)
MUHAMMED IRFAN
am 20 Jun. 2018
For a 2d Matrix, A(1,2,1,1) is equivalent to A(1,2).
Consider it as A(dimension1,dim2,dim3,dim4). As it is a 2d matrix, the value of dim3,dim4,dim5... will be 1.
ie, A(1,2,1,1,1,1,1,1,1,1) will also give you the value 2 !!
1 Kommentar
Jan
am 20 Jun. 2018
+1. Exactly. In Matlab singleton trailing dimensions are ignored.
x = zeros(2,3,1)
size(x) % [2, 3]
size(x, 9) % 1
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