How to deal the points on matrix with specific width size using Matlab?

Hi Matlab community members,

i am using this code to fill or label as '1' in the matrix with respect to width size as 10

So if the ii and jj indexes are present, the number 1 will be filled. its good.

But i need help how to deal that matrix where only zeros are present.

i want to fill that grid only as '0'. I tried to use if else statement but could not succed.

Will be very thankful for guidance and help.

regards,

xx =  -40:10:40;
yy =  -40:10:40;

Boundary_x = 10*floor(Slice_x/10);
Boundary_y = 10*floor(Slice_y/10);
[~,ii]=ismember(Boundary_x,xx);
[~,jj] = ismember(Boundary_y,yy);

Result_matrix(sub2ind([Size_x,Size_y],ii,jj))=1;

[KSSV]

VEry confusing. Question is not clear. Can you show with one working example?

[M.S. Khan]

Hi KSSV, see the last line i.e. Result_matrix shows that matrix having numbers within width =10 with respect to ii and jj will be assigned 1.

Bu If if there was no number exist with respect to width = 10 using ii and jj, how the result_matrix will be.

Answer 1

[KSSV]

If you know the dimensions of the Result_matrix you can initialize it either zeros or NaNs or ones. Depending on your requirement.

m = 10 ;   % number of rows 
n = 10 ;   % number of columns
P = zeros(m,n) ;  % all m*n zeros
Q = NaN(m,n) ;    % all m*n NaNs
R = ones(m,n) ;   % all m*n ones 

[M.S. Khan]

i dont want to initialize it. i have alrady intialize it as zeroes (m,n).

Suppose i have a matrix with different numbers.

i want them to distribute those numbers in each grid with respect to width size as 10.

if any numbers exist, that cells will be labelled as 1 in the result_matrix.

My problem is if there is no number coming in cell with width size =10, then how the cells of the result_matrix would be.

Thanks for feedback.

i am trying to make an example.