add information in readme and tutorial files

README.md

@@ -1,5 +1,5 @@
 # matlabHTK
-## Matlab Interface to HTK for Bioacoustic
+## Matlab/Octave Interface to HTK for Bioacoustic
 
 ---
 
@@ -9,6 +9,12 @@ MatlabHTK uses VOICEBOX speech processing toolbox MATLAB routines to read/write
 
 ---
 
+##  How to cite
+
+Please use: Ranjard, L., Reed, B. S., Landers, T. J., Rayner, M. J., Friesen, M. R., Sagar, R. L. and Dunphy, B. J. (2016). MatlabHTK: A simple interface for bioacoustic analyses using hidden Markov models. Methods in Ecology and Evolution. doi:10.1111/2041-210X.12688
+
+---
+
 ##  Function documentation
 The calls to HTK functions are _**indicated**_.
 

Tutorial_diving_petrel/tutorial.md

@@ -10,8 +10,12 @@ Open Octave or Matlab. Add the matlabHTK function to the Matlab/Octave path and
 addpath(genpath('/home/louis/matlabHTK-master')) ;
 cd /home/louis/matlabHTK-master/Tutorial_diving_petrel ;
 more off;
+graphics_toolkit("gnuplot");
 ```
 Use `more off;` in Octave to suppress some unnecessary messages (disable Paging Screen Output).
+Depending on how you downloaded the package, you may need to use the path '/home/louis/matlabHTK' instead of '/home/louis/matlabHTK-master'.
+For correctly displaying plots in Octave, make sure you are using the gnuplot system `graphics_toolkit("gnuplot");`.
+
 
 #### Training
 Set up and train HMMs for each label found in the manually annotated label files in training directory
@@ -31,6 +35,7 @@ Plot the recognition results for the label 'diving_petrel'. Input the date and t
 plot_Label('./recognition/recording.label','./recognition/recording.wav','diving_petrel',10,'25/09/2014 18:00:00',1);
 ```
 
+
 ---
 
  

plot_Label.m

@@ -10,17 +10,17 @@
 end
 
 if nargin<5
-    timestart = 0;
+    timestart = datestr(now,'dd/mm/yyyy HH:MM:SS') ;
     if nargin<4
         % choose bin size in seconds
         binsiz = 60 ;
         if nargin<3
             label = 'diving_petrel' ;
         end
     end
-else
-    timestart = datenum(timestart,'dd/mm/yyyy HH:MM:SS') ;
 end
+
+timestart = datenum(timestart,'dd/mm/yyyy HH:MM:SS') ;
 
 % get the Fs
 %tmp = regexprep(filename(end:-1:1),'dirGtxeT.','vaw.','once');