清空筛选条件
清空筛选条件

Count unique values in an array

5 次查看（过去 30 天）
Ana
Ana 2014-3-29
评论： Ana 2014-3-30
Hello,
I have the following set of data
I need to count how many times the values in column 3 appear. So, for instance: SABC appears 4 times. BTFG appears 20 times. GCBK appears 7 times and so on.
Afterwards I would want to erase the rows for the variables that appear less than 100 times. Is there an efficient way to do this? I'm new at matlab. Thank you so much in advance.

请先登录，再回答此问题。

采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2014-3-29
编辑：Azzi Abdelmalek 2014-3-29
If M is your cell array Try this,
c3=M(:,3)
[ii,jj,kk]=unique(c3)
f=histc(kk,1:numel(jj)); % Frequencies corresponding to ii
idx=f<100
idx1=ismember(c3,ii(idx))
M(idx1,:)=[]

更多回答（1 个）

Walter Roberson
Walter Roberson 2014-3-29
hint: how many outputs can unique() have?

类别

在 Help Center 和 File Exchange 中查找有关 Shifting and Sorting Matrices 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