MATLAB: I have a matrix which size is mx1, I wanna give number for each value in a row starting 1 and ends m.

faqmatrix

for example;

a=[0.1;0.2;0.3;0.4;0.5]

value_1=0.1 value_2=0.2 value_3=0.3 …..value_m=0.5

how can i create "value" variable with giving the numbers related the order of columns?

Best Answer

Please read the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F

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MATLAB: Looping for replace matrix elements

   XX = [3,0,0;0,3,3;4,5,4] ;
   iwant = repmat(XX,3,1);

doc repmat.

MATLAB: How to fill gaps of rows with 3s of a matrix under certain conditions.

Let

M = [0     0     3
     3     0     0
     0     3     0
     0     0     0
     3     0     3
     0     3     0
     3     0     0
     0     0     0
     2     3     3
     0     0     0
     3     0     0
     0     1     0
     0     0     0
     3     3     3
     0     0     0];

[r,c] = size(M);
m = M;
m(m == 0) = nan;
%lo - define the indices of the values that need to be changed: 
lo = fillmissing(m,'previous') == 3 & fillmissing(m,'next') == 3 & isnan(m); 
% ii - assign numbers to intervals, own numbering for each column:
ii = cumsum([zeros(1,c);diff(lo)>0]).*lo; 
[~,jj] = ndgrid(1:r,1:c);
%{
p - count the amount of each value of matrix ii for each column
1 line the number of zeros (0's)
2 line the number of values in the first interval.
3 line the number of values in the second interval, etc.:
%}
p = accumarray([ii(:)+1,jj(:)],1);
% discard information about zeros:
p = p(2:end,:);
% a - enter the values by which our intervals will be filled (first - 3, next 4):
a = repmat([3;4*ones(max(ii(:))-1,1)],1,c); 
% condition for intervals with a single value:
a(2:end,:) = a(2:end,:) - (p(2:end,:) == 1); 
% replace the values in the M matrix with the values from a:
M(lo) = repelem(a(:),p(:));

Best Answer

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MATLAB: Looping for replace matrix elements

MATLAB: How to fill gaps of rows with 3s of a matrix under certain conditions.

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