How to vectorize a matrix?

61 Ansichten (letzte 30 Tage)
Sky Scrapper
Sky Scrapper am 8 Jan. 2019
Kommentiert: Sky Scrapper am 14 Jan. 2019
Dear All,
I have a matrix of 90x12. I need to use 2D look up table for matlab simulink. There i will have to put the vector of input values. That means, Vector for input values x:
[0 1 2 3 4 .........89] and vector for input values 'y': [0 1 2 3 4 5 6 ..11]. How can I write a code that will take the values for x and y automatically with the desired length?
Thanks!
  1 Kommentar
Fangjun Jiang
Fangjun Jiang am 8 Jan. 2019
Not clear. Don't understand the question.

Melden Sie sich an, um zu kommentieren.

Akzeptierte Antwort

OCDER
OCDER am 8 Jan. 2019
%Starting input
M = reshape(1:90*12, 90, 12); %your 90x12 lookup matrix
X = [0 1 3 4 89]; %input X lookup
Y = [0 1 3 5 11]; %input Y lookup
%Matlab does NOT use 0-based index. So add 1.
X = X+1;
Y = Y+1;
%Use sub2ind to to convert (X,Y) to a linear index.
Idx = sub2ind(size(M), X, Y);
%Collect your value based on index X and Y
Value = M(Idx);
In short, the above can be simplified as:
M = reshape(1:90*12, 90, 12); %your 90x12 lookup matrix
X = [0 1 3 4 89]; %input X lookup
Y = [0 1 3 5 11]; %input Y lookup
Value = M(sub2ind(size(M), X+1, Y+1));
  5 Kommentare
Stephan
Stephan am 14 Jan. 2019
Bearbeitet: Stephan am 14 Jan. 2019
A = 0:size(B,1)-1
Sky Scrapper
Sky Scrapper am 14 Jan. 2019
oh i see. i tried: A= 0 : size ((B-1),1)).
I had little bit misunderstanding. thank you very much!

Melden Sie sich an, um zu kommentieren.

Weitere Antworten (0)

Kategorien

Mehr zu Matrices and Arrays 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!

Translated by