How many zeros do I have before a specific sting variable?

8 次查看（过去 30 天）
antonet
antonet 2012-8-15
Dear all
I have
A={
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
' b1'
' b1'
' b1'
' b1'
' b1'
'b1'
' b1'
[0]
[0]
[0]
'b1'
' b1'}
I have this cell vector. This vector has a characteristic. Immediately after the first zeros the letter 'b1' begins. So I would like to count the zeros before the first 'b1' that starts to appear in this vector. In this case I have 39 zeros. Is it possible to calculate this number using a Matlab code?
thanks

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2012-8-15
yourzeros = find(cellfun(@ischar,A),1,'first')-1;

更多回答（3 个）

Matt Fig
Matt Fig 2012-8-15
编辑：Matt Fig 2012-8-15
T = strfind(cellfun(@(x) ~x(1),A).',[1 0])
Notice that T will show you the index of every zero that is followed by a nonzero. So you want T(1).
Azzi Abdelmalek
Azzi Abdelmalek 2012-8-15
min(find(cellfun(@(x) ~isnumeric(x),A)))-1
Oleg Komarov
Oleg Komarov 2012-8-15
Another solution:
pos = strfind([A{:}],'b')-1
pos(1)

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