how to organize my histogram please

I cannot get any information from your .fig file.

My best guess is that none of your data are between the limits you set.

Consider:

Data = randi(50000, 100, 1);
edges = linspace(3000, 41000, 40);                      % Define 39 Bins With 40 Edges
histogram(Data, edges)

This produces an appropriate histogram, with the appropriate edges and 39 bins.

When I add a get call to my previous code: Data =

randi(50000, 100, 1);
edges = linspace(3000, 41000, 40);                      % Define 39 Bins With 40 Edges
histogram(Data, edges)
XL = get(gca,'XLim')

the result is:

XL =
        1100       42900

so the result is appropriate, and does not extend from 0 to 45000. The 'BinEdges' and 'BinLimits' correspond to those I set in my code. The 'BinEdges' returned by:

BE = Ax.Children.BinEdges

coresponds to those I set in my code. The width of each bin is about 974.36, since those are the requirements you set.

You may need to experiment with the number of bins you want and how to define them. I am using the information you provided, to produce the histogram result you specified.

What is your definition of didn’t work?

This code:

filename = 'test.txt';
Load = load(filename);
edges = linspace(3000, 41000, 40);                                      % Define 39 Bins With 40 Edges
histObject = histogram(Load, edges, 'Normalization','probability');

produces this plot: