how to fill pre allocated matrix using two columns vectors

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M.S. Khan
M.S. Khan 2019-6-26
评论： erik jensen 2020-4-28
Matrix = zeros(5)
interval range =10
X = [ 35;43;22]
Y = [75;44;67]
40
50
Y 60
70
80
10 20 30 40 50
X - axis
how to fix these values inside the above grid using matlab coding.
i have tried a lot using for loops but its not comming correct.
All cooperation is highly appreicated.
Regards

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2019-6-26
xx = 10:10:50;
yy = 40:10:80;
X = [ 35;43;22];
Y = [75;44;67];
m = numel(xx);
n = numel(yy);
out = zeros(m,n);
x10 = 10*floor(X/10);
y10 = 10*floor(Y/10);
[~,ii] = ismember(x10,xx);
[~,jj] = ismember(y10,yy);
out(sub2ind([m,n], ii, jj)) = 1;
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M.S. Khan
M.S. Khan 2019-7-17
Mr. Andrei Bobrov. ,
https://www.mathworks.com/matlabcentral/answers/468916-how-to-fill-pre-allocated-matrix-using-two-columns-vectors#answer_380843
Thanks for giving me input,. i have done it succesfully.
Could you plz guide me how to only label the interior part of the object using same techniqure.
Same question but only need the interior part to be labelled as 2 or 1.
i will be very thankful.
warm regards
erik jensen
erik jensen 2020-4-28
This is wrong.
ii, jj, and kk are INDEXES not SUBSCRIPTS. So for a larger data set, would fall out of range

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更多回答（2 个）

KSSV
KSSV 2019-6-26
X = [ 35;43;22] ;
Y = [75;44;67] ;
[X,Y] = meshgrid(X,Y);
madhan ravi
madhan ravi 2019-6-26
% Illustration
Matrix = zeros(5);
X = (10:10:50).'; % column vectors
Y = (40:10:80).';
Matrix(end,:) = X.';
Matrix(:,1) = Y
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