How can I divide my text file in several blocks?

I want to read my text file "January_5d" and divide it in 5 different blocks(day by day)because I would like to plot the several trending. What I have so far is:

    % code
YourFilePath = 'C:\Users\Matlab\January_5d.txt';
fid = fopen(YourFilePath ,'rt');
Datafile = textscan(fid,'%s%s%s%s%s','Headerlines',2);
    %Allocate all the measured value in the "Value1" variable
Value = Datafile{3};
Value = cellfun(@(x) textscan(x,'%s','Delimiter', ' ')',Value ,'UniformOutput',false);
Y = vertcat(Value{:});
X = cellfun(@transpose,Y,'UniformOutput',false);
Z = cellfun(@str2double,X,'UniformOutput',false);
Value1=cell2mat(Z);
    %Allocate all the times in the "Time1" variable
Time (:,1)= Datafile{2};
Time1=cell2mat(Time);
    %close the text file
fclose(fid);

With this code I can read all the file and store all the data in the 2 variables 'Value1' and 'Time1' but I don't know how I could store the data in 5 different blocks(day by day).Can someone help me?

Answer 1

[per isakson]

This function outputs a diagram for day one

    function    cssm

        YourFilePath = 'h:\m\cssm\January_5d.txt';
        fid = fopen( YourFilePath, 'rt' );
        Datafile = textscan( fid, '%s%s%f%s%s'                      ...
                           , 'Headerlines',2, 'CollectOutput', true );
        fclose(fid);
        %Allocate all the measured value in the "Value1" variable
        Value1 = Datafile{2};
        %Allocate all the times in the "Time1" variable
        Time1 = datevec( cell2mat( Datafile{1} ), 'yyyy-mm-ddHH:MM:SS' );

        block1 = Value1( Time1(:,3)==1 );
        t1     = Time1 ( Time1(:,3)==1, : );

        figure, plot( datenum(t1)-datenum(t1(1)), block1 ) 
    end

[Matteo]

It works!I put a for loop for plot different figures for different days. Can you explain me the use of 'Collectoutput'??Do you think it is necessary in this case??I guess it could work also without it

[per isakson]

On CollectOutput doc says

    If true, then textscan concatenates consecutive output cells of 
    the same fundamental MATLAB class into a single array.

I think that data and time concatenated makes the code easier to read and understand. Yes, this just one way out of several alternatives.

[Matteo]

You are right!thank you very much!