Data reading/Filtering, Excel>>Array

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Hello kity
Hello kity 2012-12-11
Hi,
I have an excel file with data.
an example
colom1:
1
2
3
4
5
empty
empty
6
7
8
9
10
empty
empty
What I want to do is this:
  • get every number above the first empty cell (in example the number 5 and 10)
  • then calculate, 5 - 1 , 5 -2 , 5-3 ,5-4
same for the next set of data (10-6 10-7 10-8 10-9), this for the entire colom.
With xlsread I read the file, then select the colom with num(:,x). I get an arraw with numbers then 2 Nanns between each set of data....
what then to do...

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回答（2 个）

Vishal Rane
Vishal Rane 2012-12-11
Use isnan and find functions.
Your data read from excel is something like :
a = [ 1 2 3 4 5 NaN NaN 6 7 8 9 10 NaN NaN 11 12]
find(isnan(a))
will give you the locations of all NaN in the array.
Hello kity
Hello kity 2012-12-11
编辑：Hello kity 2012-12-11
I used isnan and find. That gives me a new array with all the locations of the isnans.
for example
1 2 3 4 5 NaN NAn
I get 6 and 7 as NaN... but how can I say if you find the 6th as NaN then use the 5th to calculate, 5-1 and 5-2 etc..
thank you

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