Pad empty spaces in matrix with 0

I have a matrix of the form:

1 4 6 3 7 3

4 6 2 9

5 5 8 2 5

4 8 1 3 9 4

As I accumulated the rows of the matrix from different sources there is a inconsistency in the length of rows. How do I pad the empty spaces with 0? Please help.

[Rik]

Are these rows each in a cell? What is your exact data structure?

[Meg Cullen]

a = [c1m_wrf(:,3)';c2m_wrf(:,3)';c3m_wrf(:,3)';c4m_wrf(:,3)'];

I created a matrix but since the columns of the different cells are of different length...its not working

[Image Analyst]

What are the "empty spaces" - do you want to just pad the right hand side?

Answer 1

[Image Analyst]

Try this:

c1m_wrf = [1 4 6 3 7 3 ]
c2m_wrf = [4 6 2 9]
c3m_wrf = [5 5 8 2 5]
c4m_wrf = [4 8 1 3 9 4 ]
maxLength = max([length(c1m_wrf), length(c2m_wrf), length(c3m_wrf), length(c4m_wrf)])
ca = {c1m_wrf, c2m_wrf, c3m_wrf, c4m_wrf}
m = zeros(4, maxLength);
for row = 1 : length(ca)
	thisVector = ca{row};
	thisLength = length(thisVector);
	m(row, 1:thisLength) = thisVector;
end

You get

m =

1 4 6 3 7 3

4 6 2 9 0 0

5 5 8 2 5 0

4 8 1 3 9 4

Answer 2

[madhan ravi]

C={[1 4 6 3 7 3] ;...
   [4 6 2 9]     ;...
   [5 5 8 2 5]   ;...
   [4 8 1 3 9 4] };
M=max(cellfun('prodofsize',C));
Wanted = cell2mat(cellfun(@(x) [x zeros(1,M-numel(x))],C,'un',0))

[Rik]

It is unfortunate the pad function (R2016b and later) requires a cellstr input:

%doesn't work:
Wanted = cell2mat(pad(C,'right',0));

%does work:
Wanted = double(cell2mat(pad(cellfun(@char,C,'un',0),'right',char(0))));

I have the feeling Matlab is getting a bit less weakly typed than it used to be.

[madhan ravi]

Wow ,didn’t know that function so +1 .