HISTOGRAM_DISPLAY
Display Histogrammed Data

HISTOGRAM_DISPLAY is a MATLAB routine which reads a data file of histogram data and displays it.

The data file is presumed to contain M columns of data, and each column having N items. The first column is assumed to be an ascending series of X coordinates, to be used as the centers of a series of bars. The other columns are assumed to be Y values associated with the bars. In other words, column 1 plus any other column makes a single histogram.

To keep things simple, the program plots all the histograms together, stacking the Y values. For some data, this may be the least confusing view.

Usage:

histogram_display ('filename')

reads the data in filename and displays a stacked histogram.

Related Programs:

BAR_PLOT is a FORTRAN90 program which reads a table of data, and creates a bar plot.

TABLE is a format used for the input data file.

TABLE_HISTOGRAM is a FORTRAN90 program which reads a table of data, and creates a histogrammed table suitable for input to histogram_plot.

Source Code:

• dtable_data_read.m, reads a table from a double precision TABLE file.
• dtable_header_read.m, reads a table header from a double precision TABLE file.
• file_column_count.m, counts the number of columns in the first line of a file.
• file_row_count.m, counts the number of row records in a file.
• histogram_display.m, the main program to be called by the user.
• s_len_trim.m, returns the length of a character string to the last nonblank.
• s_word_count.m, counts the number of words in a string.
• timestamp.m, prints the current YMDHMS date as a timestamp.

Examples and Tests:

• histo1.txt, a table of 6 columns and 10 rows of histogrammed data.
• histo1.png, a PNG image of the plot.
• histo2.txt, a table of 6 columns and 10 rows of histogrammed data.
• histo2.png, a PNG image of the plot.
• histo3.txt, a table of 6 columns and 10 rows of histogrammed data.
• histo3.png, a PNG image of the plot.

You can go up one level to the MATLAB source codes.