Question

我是matlab的初学者。我正在做一个小项目，我面临有关过滤的问题我在下面有一部分数据

'black' 11  '6/21/2013' <1x1 cell>
'blue'  11  '6/3/2013'  <1x1 cell>
'yellow'12  '4/18/2015' <1x1 cell>
'white' 13  '11/11/2013'<1x1 cell>
'red'   14  '8/4/2014'  <1x1 cell>
'blue'  15  '8/4/2014'  <1x1 cell>
'yellow'16  '12/6/2014' <1x1 cell>
'red'   17  '10/4/2014' <1x1 cell>
'red'   18  '4/17/2015' <1x2 cell>
green'  19  '12/14/2014'<1x1 cell>
orange' 20  '3/18/2015' <1x1 cell>

数据的最后一列是一个单元格数组，其中包含一些值，如下所示：

<1x1 cell>  'b1'    
<1x1 cell>  'c1'    
<1x1 cell>  'b2'    
<1x1 cell>  'c1'    
<1x1 cell>  'b5'    
<1x1 cell>  'd2'    
<1x1 cell>  'f1'    
<1x1 cell>  'f1'    
<1x2 cell>  'b2'    'c1'
<1x1 cell>  'c1'    
<1x1 cell>  'c1'

我想计算b1，c1，f1（整个数据集的值从a到z，a1到z1等等）的出现次数到用户选择的两个日期之间，输出为< / p>

from date:
to date: 

      count
f1 
b1
c1

谢谢你的帮助。

Answer 1

StartDate = input('What is the start date ','s'); % Prompt user for start date
EndDate = input('What is the end date ','s'); % Prompt user for end date
StartDate = datenum(StartDate); % Convert to datenum
EndDate = datenum(EndDate);

a=0;b=0;c=0; % Initalise counters
alphabet = {'a', 'b', 'c', ....} %EXPAND THIS TO Z
lettercount = zeros(1,numel(alphabet));
for ii = 1:size(YourCell,1)
   celldat = datenum(YourCell{ii,3}); % Get date 
   if celldat > StartDate && celldat < EndDate % Check time boundaries
     for jj = 1:size(YourCell{ii,4})
         tmp = strcmp(YourCell{ii,4}{jj},alphabet);
         lettercount = lettercount + tmp;
     end
   end
end

这里发生的是您首先提示用户输入您的时间间隔的开始和结束日期。然后，您将所有日期转换为datenum以便于比较。初始化计数器，然后针对每个单元格根据提示日期检查日期，如果在该时间段内，则在lettercount中收集字母，其中lettercount(1)=a，lettercount(2)=b，等

matlab中的数据过滤

1 个答案: