Finding a Number in a random array

So I am given the code p1pA=magic(7).

How would I use Matlab to find the number in the fourth row and sixth column?

Also how would I find the twentieth number?

Answer 1

[Kevin Phung]

How would I use Matlab to find the number in the fourth row and sixth column?

p1pA=magic(7);

p1pA(4,6) %The syntax is p1Pa(row,column)

Also how would I find the twentieth number?

p1pA(20) 

% if just 1 index provided, the indices go column by column.
%Ex :[1 4 7]
%    [2 5 8]
%    [3 6 9]

Answer 2

[Turlough Hughes]

Have a look at the following documentation and scroll down to the part about indexing matrices with two subscripts. For your second question I believe you are looking for linear indexing which is the next section.