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How to find the number of non-NaN elements in a column that are NaN in the last column, in MatLab?

2 次查看（过去 30 天）
Julia
Julia 2023-1-30
评论： Julia 2023-1-30
Let's say I have a matrix
50 15 20 35 20
NaN NaN NaN 25 20
15 20 25 NaN NaN
NaN NaN 35 20 15
I want to find out the number of elements that are non-NaN in a column but are NaN in the last column.
For example, in Column 4, there is 1 element (4,2) that is non-NaN in Column 4 but is NaN in Column 3.
How do I find this number for each column?
Thank you so much!

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采纳的回答

James Tursa
James Tursa 2023-1-30
编辑：James Tursa 2023-1-30
Ran in:
Code is written from a slightly reordered wording:
"for each column, number of elements that are NaN in the last column and non-NaN in a column"
sum(isnan(YourMatrix(:,end)) & ~isnan(YourMatrix(:,1:end-1)))
E.g.,
YourMatrix = [
50 15 20 35 20
NaN NaN NaN 25 20
15 20 25 NaN NaN
NaN NaN 35 20 15]
YourMatrix = 4×5
50 15 20 35 20 NaN NaN NaN 25 20 15 20 25 NaN NaN NaN NaN 35 20 15
sum(isnan(YourMatrix(:,end)) & ~isnan(YourMatrix(:,1:end-1)))
ans = 1×4
1 1 1 0
Result is the number of elements matching criteria for each column except the last column.
  4 个评论
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Walter Roberson
Walter Roberson 2023-1-30
Ran in:
YourMatrix = [
50 15 20 35 20
NaN NaN NaN 25 20
15 20 25 NaN NaN
NaN NaN 35 20 15];
sum(isnan(YourMatrix(:,1:end-1)) & ~isnan(YourMatrix(:,2:end)))
ans = 1×4
0 1 1 0

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更多回答（1 个）

Walter Roberson
Walter Roberson 2023-1-30
isnan(YourMatrix(:, 3)) & ~isnan(YourMatrix(:, 4))

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