# how to fill pre allocated matrix using two columns vectors

2 views (last 30 days)
M.S. Khan on 26 Jun 2019
Commented: M.S. Khan on 17 Jul 2019
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

#### 1 Comment

Shashank Sharma on 26 Jun 2019
It is unclear as to what you are attempting.
What is the expected output of your code ?

Andrei Bobrov on 26 Jun 2019
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;

M.S. Khan on 26 Jun 2019
Thanks you so much Mr Andrei Bobrov. God bless you. Warm regards.
M.S. Khan on 17 Jul 2019
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

KSSV on 26 Jun 2019
X = [ 35;43;22] ;
Y = [75;44;67] ;
[X,Y] = meshgrid(X,Y);

madhan ravi on 26 Jun 2019
% Illustration
Matrix = zeros(5);
X = (10:10:50).'; % column vectors
Y = (40:10:80).';
Matrix(end,:) = X.';
Matrix(:,1) = Y