delete zeros from matrix

2 次查看（过去 30 天）
Maria K
Maria K 2020-7-23
回答： Bruno Luong 2020-7-23
How do I delete all the columns that have zeros with a for loop? I tried reducing the number of columns by one in every iteration but matlab shows me "index exceeds matrix dimentions".
p4 = [0 0 31 37 43 47; 0 0 19 13 7 3];
grammes = size(p3,1);
sthles = size(p3,2);
for i = 1 : grammes
for j = 1 : sthles
if iszero(p3(i,j)) == 1
p3(:,j) = [];
sthles = sthles - 1
end
end
end

请先登录，再回答此问题。

采纳的回答

Bruno Luong
Bruno Luong 2020-7-23
Here is how using FOR-LOOP to delete zero column(s)
A = [0 0 31 37 43 47;
0 0 19 13 7 3];
[m,n] = size(A);
for j = n:-1:1 % must loop reversing
deleteflag = true;
for i = 1 : m
if A(i,j) ~= 0
deleteflag = false;
end
end
if deleteflag % only true if the entire column #j contains 0s
A(:,j) = [];
end
end

更多回答（1 个）

madhan ravi
madhan ravi 2020-7-23
p4(:, all(p4 == 0)) = []
  1 个评论
Maria K
Maria K 2020-7-23
Cool answer but I would like to know how to do it with a for loop..

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Numerical Integration and Differential Equations 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by