difficulties with Histograms

[altamiranomaxi]

Hello!

I've got some issues while trying to plot an histogram, in order to compare
it with a p.d.f. given.

1) First of all, I can't find the best way to make an histogram with the
frequencies of appearance of each value. I've used the commands below.
2) Also, although at first the histogram was being shown correctly, now it
just doesnt show up. When the plot appears, it has only the p.d.f. in it.
        
        g=[];
        for i=1:ensayos
                g=[g,TiempoMuerte_Cte(N,c)];
        endfor
        h = hist(g,ensayos,1)
        hold on
        x = 0:0.1:30;
        x_2=exp(-x) - x/(N)- 1; 
        f = N*exp(N*(x_2));     
        plot(x,f)




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