plotting date on x-axis

[Simon]

Thank you Eric, thank you Francis again...

I got it on my way home :)



For everbody having the same problem, I will post here my complete 
program (I have three files in the src-directory, which have a three row 
header and below six columns with data).

So thank you all again! Best wishes,
Simon

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src = 
["/home/romsim/workspace/scilab/"];                                       
// path

files =list("qbas", "qges", 
"etr");                                                         // files 
to be read

for 
i=1:length(dateien)                                                                       
// for file in files...
  a_src = [src  + files(i) + 
".dat"];                                                        // 
building current path
  myfile = mopen(a_src , 
"r");                                                              // 
open file
  mgetl (myfile, 
3);                                                                               
// reading first three rows (header)
  data = mfscanf(-1, myfile, "%i %i %i %i %e 
%e");                           // reading data (six columns; the first 
four are for the date)
  if i==1 
then                                                                                       
// the first file gives the info for the date (it's the same for all files)
    y = data(:,1);                     // year
    m = data(:,2);                    // month
    d = data(:,3);                     // day
    t = data(:,4);                      // time
   
    dates = datenum(y, m, d) 
;                                                            // building 
date (serial)
    all = 
[dates];                                                                                    
// initialising the main matrix
end

  all = [all, data(:,5)];         // appending the data from current file
   
  
mclose(myfile);                                                                                
// close file
end

plot(all(:,1), [all(:,2), all(:,3), 
all(:,4)])                                                  // plotting
h = 
gca();                                                                                          
// getting a handle on the axis entities
v1 = 
h.x_ticks;                                                                                 
// reading x-ticks
v_dat = 
datevec(v1(2));                                                                   
// extracting and reformatting date
v_dat = [string(v_dat(:,2)) 
string(v_dat(:,1))];                                  // preparing 
string-vector

v_neu=[];                                                                                           
// initialising new x-tick-vector
s=size(v_dat);                                                                                  
// reading vector-size
for k=1:s(1)  v_neu=[v_neu  v_dat(k,1) + "/" + v_dat(k,2)]; end     // 
building new x-tick-vector
h.x_ticks.labels = 
v_neu;                                                                 
// set new x-tick-values