create large matrix from data

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KA 2016-4-9

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评论： KA 2016-4-11

Hi, I have imported some data from an excel spreadsheet as a numerical matrix 145x3 as shown below

I now want to transform these data into a much larger matrix of 145x522. Reading the table above, row 1 in this new matrix will have the value shown in cell 1:3 (0.2203) but only between the positions shown in cells 1:1 (start point) and 1:2 (end point) i.e. cells 1:1 to 1:12. Row 2 in the new matrix will have the value 0.1597 (all of the values are defined in the 3rd column) but only between the positions shown in cells 2:1 (start point) and 2:2 (end point) i.e. cells 2:2 to 2:12, and so on. Matrix positions that are undefined will be set to a value of zero.

Does anyone know how to do this?

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Answer 1

dpb 2016-4-9

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编辑：dpb 2016-4-10

在 MATLAB Online 中打开

Just expand the output by rows is the "braindead" solution...assume the given array is dat

Nrow=size(dat,1);  % the number of rows
Ncol=522;          % whatever defines the column size
x=zeros(Nrow,Ncol);
for i=1:Nrow
  x(i,dat(i,1):dat(i,2))=dat(i,3);
end