What is meaning of c(:,1) and . in matlab code
259 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
I have code .What does it mean?
c(:,1)=0.5*ones(10,1); //What is c(:, 1)?
for i = 1:s
Delta(:,i)=(2*round(rand(2,1))-1).*rand(2,1); //What is .?
end
for m=1:s
P(1,:,1,1,1)= 50*rand(s,1)'; //What is ' and P(1, :, 1,1,1)?
P(2,:,1,1,1)= 0.2*rand(s,1)';
end
1 Kommentar
Akzeptierte Antwort
Jan
am 26 Apr. 2016
I agree with dpb: To use a powerful programming language like Matlab, you have to read the manuals. The forum is not the right location to explain the basics, because they are explained in the "Getting Started" chapters exhaustively already.
- You will find out, that c(:,1) is the first column of the matrix "c", e.g. a column vector.
- The operator is not "." but ".*", which means an elementwise multiplication. A * B is a matrix product, while A .* B multiplies the elements of the arrays.
4 Kommentare
Jan
am 6 Jun. 2022
[MOVED from flags] Paula Carrasco Molina about 2 hours ago. Hey man, sometimes you're not using Matlab every day and only want to solve a straightforward question and forget Matlab forever. If you're going to answer like that, better not respond and let someone else do it
Jan
am 6 Jun. 2022
Bearbeitet: Jan
am 6 Jun. 2022
@Paula Carrasco Molina: I've explained, what these operators do and in addition how you can find this out by your own. If you have a good or even better answer, feel free to post it here to support the asking persons. The original poster has accepted this answer as a solution, so it was useful obviously.
You are not in the position to tell others how to answer.
Weitere Antworten (2)
dpb
am 26 Apr. 2016
Start at the beginning of <getting-started-with-matlab> and work through the tutorials to pick up basic syntax quickly...
0 Kommentare
edwinda ramadahani
am 3 Jun. 2022
A=[1 4 2;3 1 5], B=[1 5 2;-1 0 1;3 2 4], Q=[6 1 3;-1 1 2;4 1 3]
what is the syntax for (BA)+Q
1 Kommentar
Rik
am 3 Jun. 2022
If you have trouble with Matlab basics you may consider doing the Onramp tutorial (which is provided for free by Mathworks).
You also posted your question as an answer.
As to your question; there are two options of what you could mean, both shown below. Neither works, for different reasons.
A=[1 4 2;3 1 5];
B=[1 5 2;-1 0 1;3 2 4];
Q=[6 1 3;-1 1 2;4 1 3];
try
(B*A)+Q
catch ME,warning(ME.message),end
try
(B.*A)+Q
catch ME,warning(ME.message),end
Siehe auch
Kategorien
Mehr zu Matrix Indexing finden Sie in Help Center und File Exchange
Produkte
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!