What is the meaning of y{1,2} in matlab?

I have done 100 regressions by using loop command and there, for dependent variable i have given command that, y{i}=file{1,i}(:,3);

That means, 3rd column is the dependent variable in each sheet. But when i am entering it, the value of y{1,1} remained same, but the value of y{1,2} and the rest which is expected to be the dependent variable for the next sheet is changing. Therefore, i want to know what is the meaning of y{1,2}, y{1,3} and so on.

So that i can able to rectify that the whether the value of y{1,2} gives the picture of dependent variable in the 2nd sheet and similarly, y{1,3} gives the picture of DV in the 3rd sheet and so on or not?

Answer 1

[Image Analyst]

It's well explained by the FAQ: http://matlab.wikia.com/wiki/FAQ#What_is_a_cell_array.3F

You have a cell array that you loaded up with vectors that are the third column of a file.

y{i}=file{1,i}(:,3);

So this is a 1-D cell array - a row vector of cells. So if you do y{1,2} or y{1,3} you are getting the contents of the cell in row 1 and column 2 or 3. However since there is only one row, the 1 is unnecessary. So, for this particular shape of y (a row vector), y{1,col} is the same as y{col}.

If you did y{145, 3} you'd get an error because there are not 145 rows in y, there is only a single row of cells.

It's the same with any array, even doubles. If you have a double row vector, rowVec(1, col) is the same as rowVec(col), and if you have a column vector, you can specify the column as 1 and it's the same (but unneeded) so colVec(row, 1) = colVec(row). The 1 is redundant and unneeded. And again, specifying a first index > 1 for a row vector, or a second index more than 1 for a column vector will throw an error.

[SUBHAMITRA PATRA]

Thank you sir, i got your answer. But, i think in the case of loop, its interpretation will be different. So, the meaning of y{1,i} meaning will be the dependent variable, in the particular column for n number of sheets. Is it right?

[Walter Roberson]

The interpretation is the same whether you are in a loop or not.

Answer 2

[KSSV]

That means y is a cell array and you are extracting 1,3 element out of it. If you want to know it's class type class(y) and if you want it's size type size(y)

[SUBHAMITRA PATRA]

Sorry sir. I didn't get your answer. My query is that whether in y{1 2}, 2 is for 2nd sheet or not? Then what is the meaning of 1 here?

[Walter Roberson]

Not. MATLAB does not have "sheets".

[Image Analyst]

1 is the row and 2 is the column.