Matrix "User Define"

Question

ANAND ASP 2020-11-26

评论： KSSV 2020-11-26

i wanna make matrix like user define matrix

take input from user but in case user dont know the value, they can put "NO"

user (2,2) dont know the value,

Matrix= 12 45 5

50 NO 63

45 56 66

that value i can read and modified also...

Answer 1

KSSV 2020-11-26

What you gave is a combination of numbers and strings.....this cannot be acieved by a matrix. But you can use cell arrays for this.

A = [{1} {2} ; {'NO'} {3}] ;

If you want matrix, you can consider repalcing with NaN instead of NO

A = [1 2 ; NaN 3] ;

KSSV 2020-11-26

Yes easily can be changed...you can get the indices of NaN using isnan.

idx = isnan(A) ;   % get logical indices of NaN
A(idx) = 3 ; 