Matlab - colon

Question 1

what does a colon mean when you use it in round brackets

Answer 1

it means everything in a row or column and is normally used to extract data from a matrix

Question 2

what would E( : , 2 ) mean

Answer 2

everything in COLUMN 2 of E

Question 3

if the matrix is

E = 1 2 10
4 5 6
7 8 9

what would
» E(:,2) print?

Answer 3

ans = 2
5
8

Question 4

what would E(2,:) mean?

Answer 4

every column in ROW 2 of E

Question 5

if the matrix is
E = 1 2 10
4 5 6
7 8 9

what would&raquo_space; E(2,:) print?

Answer 5

ans = 4 5 6

Question 6

what does this mean E(:)

Answer 6

it would rearrange everything in E into one long column

Question 7

what does a colon mean between two numbers

Answer 7

it means to count from A to B one integer at a time

Question 8

what would this command print?

F = 5:10

Answer 8

F = 5 6 7 8 9 10

Question 9

what does this mean F(:,3:5)

Answer 9

from matrix F, everything in columns 3, 4 and 5

Question 10

what does a set of three numbers mean when using two colons? example: G = 3:4:20

Answer 10

the middle number specifies in what increments to count from A to B.

from example: ans = 3 7 11 15 19