How can I count how many numbers are different from '-1'?

4 visualizaciones (últimos 30 días)
Davide Conti
Davide Conti el 1 de Nov. de 2019
Comentada: Walter Roberson el 5 de Nov. de 2019
Hi,
Example: Suppose we a have a matrix A
A= [1 -1 0 -1 0 0 -1 0 -1 -1 -1 -1 -1 -1 -1]
How can I count how many numbers are different from '-1'?
  2 comentarios
Shubhashree Bal
Shubhashree Bal el 1 de Nov. de 2019
Search for how many negative number exists in A. than subtract that from length of array. Or Write a loop for how many positive number exists in array.
Code attached below:
Close all;
clear all;
A= [1 -1 0 -1 0 0 -1 0 -1 -1 -1 -1 -1 -1 -1];
count = 0;
for i = 1: length(A)
if(A(i)>=0)
count = count +1;
end
end
Davide Conti
Davide Conti el 5 de Nov. de 2019
Ok thanks, but if i wanted to do it for every line of my matrix?
For examples:
1 -1 0 -1 0 0 -1 0 -1
4 2 3 -1 0 3 1 2 -1
in this case for the first row the numbers different form '-1' are 5, in the second row they are 7.
With your loop it comes out that in the second row they are 12, because it considers the first row.

Iniciar sesión para comentar.

Respuestas (2)

Fangjun Jiang
Fangjun Jiang el 1 de Nov. de 2019
start with B=A~=-1

Pedro Martinez
Pedro Martinez el 1 de Nov. de 2019
Total = sum (A==-1);
  1 comentario
Walter Roberson
Walter Roberson el 5 de Nov. de 2019
That gives the number of rows of -1 but the user wants the number of columns that are not -1

Iniciar sesión para comentar.

Categorías

Más información sobre Multidimensional Arrays en Help Center y File Exchange.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by