Having trouble creating an array with these conditions

[StudentinCrisis]

I'm supposed to create an array that uploads a .dat file. For example

numbers.dat has the following content:
6
0.5
2
3 3 5
1 1 4

6 is the width, 0.5 is the initial case and 2 is the number of sources, 3 3
5 indicates 3rd row and 3rd column should be filled with 5 and 11 4
indicates 1st row 1st column should be filled with 4

So for example (ignore the brackets):

[4.0000 0.5000 0.5000 0.5000 0.5000 0.5000]
[0.5000 0.5000 0.5000 0.5000 0.5000 0.5000]
[0.5000 0.5000 5.0000 0.5000 0.5000 0.5000]
[0.5000 0.5000 0.5000 0.5000 0.5000 0.5000]
[0.5000 0.5000 0.5000 0.5000 0.5000 0.5000]
[0.5000 0.5000 0.5000 0.5000 0.5000 0.5000]

I need to something to work with, I'm supposed to use this function:
function out = initGroup(grid, source1, source2, source3, source4). Any
ideas? I need some kind of direction. 




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