vector array in matlab

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ali hassan
ali hassan 2022-2-10
评论： Adam Danz 2022-2-10
assume i have folllowing vector column named as ALT_digit_
i want to know the number of times 'hi' comes in the vector column.

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采纳的回答

KSSV
KSSV 2022-2-10
LEt A be your cell array.
idx = contains(A,'hi') ;
nnz(idx)

更多回答（2 个）

Adam Danz
Adam Danz 2022-2-10
编辑：Adam Danz 2022-2-10
See strcmp (case senstive) or strcmpi (case insensitive) to compare a vector of strings to a single string. Those functions will return a logical vector. Then add the vector using sum() to count the number of matches.
n = sum(strcmpi(T.ALT_digit, 'hi'))
  1 个评论
Adam Danz
Adam Danz 2022-2-10
If your only string values are 'hi' 'lo' or '' and your Matlab release is R2016b or later, this solution is perfectly fine. But if you're using a release prior to 16b or combinations of 'hi' and 'lo', consider using a different method.

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Image Analyst
Image Analyst 2022-2-10
Yes another way : using ismember():
ALT_digit = {'lo', '', '', '', 'lo', '', '', '', 'lo', '', 'abc'}
rows = ismember(ALT_digit, 'lo')
count = sum(rows)

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