added simple matlab plotting example

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+Matlab usage
+
+
+
+%!style(html): ../evmik.css
+
+
+= How to make a simple plot =
+Suppose during the measurements we obtain the following data
+fir each parameter 'I' we measured 'V' with a particular uncertainty  dV.
+Our data is represented in the following table.
+
+|| I   | V   | dV  |
+|  .1  | 1.0 | 0.2 |
+|  1.0 | 2.2 | 0.1 |
+|  1.8 | 3.2 | 0.2 |
+|  3.3 | 3.8 | 0.2 |
+|  4.0 | 4.9 | 0.3 |
+
+First we need to transfer it to the Matlab vector variables. Pay attention to the 
+delimiter **;** between numbers
+
+``` I  = [ .1;  1.0; 1.8; 3.3; 4.0 ]
+``` V  = [ 1.0; 2.2; 3.2; 3.8; 4.9 ]
+``` dV = [ 0.2; 0.1; 0.2; 0.2; 0.3 ]
+
+First we make a  plot without error bars just to get  the basic, text after
+**%** is considered as a comment and matlab will disregard it.
+
+``` figure(1) % all plotting output will go to the particular window
+``` plot(I,V) 
+
+Easy, is not it?
+
+[simple_labeled_plot.png]
+
+
+But  **every plot**  must be  present with  title, proper  axes labels  and
+units. Note **'** for the string specifiers
+
+``` title('Dependence of voltage on current')
+``` xlabel('Voltage (V)')
+``` ylabel('Current (A)')
+
+No our plot is nice and pretty.
+
+[simple_unlabeled_plot.png]
+
+= Plotting with error bars =
+Let's open a new window for the plot
+
+``` figure(2)
+
+Now we make plot with error bars assuming that they are the same for up and down parts
+
+```errorbar(I,V,dV)
+
+Yet again we need proper labeling
+
+``` title('Dependence of voltage on current')
+``` xlabel('Voltage (V)')
+``` ylabel('Current (A)')
+
+[errorbar_plot.png]
+
+