if statement with sub cases

Question

Mohammed Qahosh 2019-6-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/467308-if-statement-with-sub-cases

编辑： per isakson 2019-6-20

采纳的回答： per isakson

在 MATLAB Online 中打开

I need to use the if statement in my code and I appreciate your help. I need it in the code like this:

I need to check the length of some thing, I have 3 cases but to of them have also 2 subcases as follows:

I have tow cases for L=17 and 2 cases for L==16 How can I manage that in the code ?

Thank you in advance for your help.

%%
A=regexp(text,'Time');
B=regexp(text,'Height');
L= B-A(1);
if L==17
    C=strfind(text,'Time');
    time_hour=str2num(text(C(1)+7:strfind(text,'Height')-9));
    time_min=str2num(text(C(1)+10:strfind(text,'Height')-6));
    time_sec=str2num(text(C(1)+13:strfind(text,'Height')-3));
    time=60*60*time_hour + 60*time_min + time_sec;
    
elseif L==17
    C=strfind(text,'Time');
    time_hour=str2num(text(C(1)+7:strfind(text,'Height')-8));
    time_min=str2num(text(C(1)+10:strfind(text,'Height')-6));
    time_sec=str2num(text(C(1)+12:strfind(text,'Height')-3));
    time=60*60*time_hour + 60*time_min + time_sec;
    
elseif L==15
    C=strfind(text,'Time');
    time_hour=str2num(text(C(1)+7:strfind(text,'Height')-7));
    time_min=str2num(text(C(1)+10:strfind(text,'Height')-5));
    time_sec=str2num(text(C(1)+12:strfind(text,'Height')-3));
    time=60*60*time_hour + 60*time_min + time_sec;
    
elseif L==16;
    C=strfind(text,'Time');
    time_hour=str2num(text(C(1)+7:strfind(text,'Height')-8));
    time_min=str2num(text(C(1)+10:strfind(text,'Height')-5));
    time_sec=str2num(text(C(1)+13:strfind(text,'Height')-3));
    time=60*60*time_hour + 60*time_min + time_sec;
elseif L==16
    C=strfind(text,'Time');
    time_hour=str2num(text(C(1)+7:strfind(text,'Height')-8));
    time_min=str2num(text(C(1)+10:strfind(text,'Height')-6));
    time_sec=str2num(text(C(1)+12:strfind(text,'Height')-3));
    time=60*60*time_hour + 60*time_min + time_sec;
end

2 个评论
显示无隐藏无

per isakson 2019-6-16

编辑：per isakson 2019-6-16

"I have two cases for L=17 and 2 cases for L==16" How do the two cases differ? I don't want to figure that out by backward engineering your script.

I believe that the task can be solved by a few lines of code, either with sscanf() or better use of regexp(). If such a solution would be helpful, please provide a handful of examples of the text that shall be parsed.

Mohammed Qahosh 2019-6-16

在 MATLAB Online 中打开

Hi Per isakson, this is one of the cases and as time goes on the numbers change. and I am using matlab R2013 release

text='Time = 16:0:16 Height'

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

per isakson 2019-6-16

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/467308-if-statement-with-sub-cases#answer_379372

编辑：per isakson 2019-6-20

在 MATLAB Online 中打开

read_pco_header.m

Try

%%
text = 'Time = 16:0:16  Height';
%%
num = sscanf( text, 'Time = %d:%d:%d  Height' );
time = [ 60*60, 60, 1 ] * num;

added in response to comment

%%
text = 'Time = 16:0:16  Height';
%%
num = sscanf( text, 'Time = %d:%d:%d  Height' );
t1  = [ 60*60, 60, 1 ] * reshape( num, [],1 );
%%
cac = regexp( text, '(?<=Time = )(\d+):(\d+):(\d+)(?=  Height)', 'tokens' );
t2  = [ 60*60, 60, 1 ] * reshape( str2double(cac{1}), [],1 );
%%
t1==t2

outputs

ans =
  logical
   1

In response to request in separate answer

Run

>> tic, S = read_pco_header( 'h:\m\cssm\pco.txt' ); toc
Elapsed time is 0.011812 seconds.

and peek on the result

>> S
S = 
  struct with fields:
         FileName: "D:\experiment\MoleculeExp\FEM\Video\v190322ad\v190322ad_0.pco"
     File_version: "1"
             Date: "22.3.2019"
             Time: 54745
           Height: 600
            Width: 800
          Binning: 1
    Exposure_Time: 1000
          Average: 5
      Temperature: 45
       Pixel_Rate: 12
      Tip_Voltage: 2100
    Shutter_State: 0
>> 

and

>> S.Time
ans =
       54745
>> 

where

function    S = read_pco_header( filespec )
%{    
S = read_pco_header( 'h:\m\cssm\pco.txt' );
%}    
    S = struct(                  ...
          'FileName'      , {[]} ...
        , 'File_version'  , {[]} ...
        , 'Date'          , {[]} ...
        , 'Time'          , {[]} ...
        , 'Height'        , {[]} ...
        , 'Width'         , {[]} ...
        , 'Binning'       , {[]} ...
        , 'Exposure_Time' , {[]} ...
        , 'Average'       , {[]} ...
        , 'Temperature'   , {[]} ...
        , 'Pixel_Rate'    , {[]} ...
        , 'Tip_Voltage'   , {[]} ...
        , 'Shutter_State' , {[]} ...
        );
    fid = fopen( filespec, 'rt' );
    chr = fscanf( fid, '%c' , 2048 );
    fclose( fid );
    
    string_array = string( strsplit( chr, '\n' ) );
    
    for str = string_array
        tokens  = split( str, ["=",":"] );
        key     = strtok( tokens(1) ); 
        switch key
            case "PCO"
                % do nothing
            case "FileName"
                %  The separator, ":", between name and value ...  
                S.FileName = strtrim(tokens(2)+":"+tokens(3));
            case "File_version"
                S.File_version = strtrim(tokens(2)); 
            case "Date"          
                S.Date = strtrim(tokens(2)); 
            case "Time"
                S.Time = [3600,60,1]*reshape( str2double(tokens([2,3,4])), [],1 );
            case "Height" 
                S.Height = str2double(tokens(2));
            case "Width"         
                S.Width = str2double(tokens(2));
            case "Binning"
                S.Binning = str2double(tokens(2));
            case {"Exposure","Exposure_Time"}
                S.Exposure_Time = str2double(strtok(tokens(2)));
            case "Average"       
                S.Average = str2double(tokens(2));
            case "Temperature"   
                S.Temperature = str2double(tokens(2));
            case {"Pixel","Pixel_Rate"}
                S.Pixel_Rate = str2double(tokens(2));
            case {"Tip","Tip_Voltage"}   
                S.Tip_Voltage = str2double(tokens(2));
            case {"Shutter","Shutter_State"}
                S.Shutter_State = str2double(tokens(2));
            case "End"
                % do nothing
            case "" 
                % do nothing
            otherwise
                error(  'read_pco_header:UnknownKey'     ...
                    ,   'Unexpected key, "%s", in "%s%"' ...
                    ,   key, filespec                    )
        end
    end
end
   

Afterthought

I uploaded a somewhat improved version of read_pco_header

and here is a version of the "regexp-script" that works with the test file

%%
ffs = 'h:\m\cssm\pco.txt';
fid = fopen( ffs, 'rt' );
chr = fscanf( fid, '%c' , 2048 );   
fclose( fid );
cac = regexp( chr, '(?<=Time = )(\d+):(\d+):(\d+)\s+Height', 'tokens' );
t2  = [ 60*60, 60, 1 ] * reshape( str2double(cac{1}), [],1 );
%%

It feels like overkill to include "Height" in the regular expression. However, it's included in the original question.

14 个评论
显示 12更早的评论隐藏 12更早的评论

Mohammed Qahosh 2019-6-16

per isakson Really thank you. This is too much. I appreciate your help :)))

per isakson 2019-6-17

I'm glad if it's useful and will be used.

I uploaded a somewhat improved version of read_pco_header

请先登录，再进行评论。

Answer 2

Mohammed Qahosh 2019-6-16

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/467308-if-statement-with-sub-cases#answer_379389

在 MATLAB Online 中打开

*I have thousands of pictures in the pco format

*I am using these pictures to find the change in the intensity

*each of these pictures has informations : Time, Voltage , .......

*I need to find the Time of at which each picture was taken

*from the code already exists the previous student found the width, height and exposure time

*Now I need to find the time

PCO Pixelfly USB Image
FileName: D:\experiment\MoleculeExp\FEM\Video\v190322ad\v190322ad_0.pco
File_version = 1
Date = 22.3.2019
Time = 15:12:25
Height = 600
Width = 800
Binning = 1
Exposure Time = 1000 msec
Average = 5
Temperature = 45
Pixel Rate = 12
Tip Voltage = 2100
Shutter State = 0
End
                                                                                                                                                                                                                                                          

These are the data contained in each picture. But the time changes

So, how can I use his code to get the time?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

if statement with sub cases

2 个评论
显示无隐藏无

采纳的回答

14 个评论
显示 12更早的评论隐藏 12更早的评论

更多回答（1 个）

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

另请参阅

类别

标签

Community Treasure Hunt

if statement with sub cases

2 个评论 显示 无隐藏 无

采纳的回答

14 个评论 显示 12更早的评论隐藏 12更早的评论

更多回答（1 个）

0 个评论 显示 -2更早的评论隐藏 -2更早的评论

另请参阅

类别

标签

Community Treasure Hunt

2 个评论
显示无隐藏无

14 个评论
显示 12更早的评论隐藏 12更早的评论

0 个评论
显示 -2更早的评论隐藏 -2更早的评论