VHSTP
Prints a vertical histogram.
Required Arguments
FRQ — Vector of length NBAR containing the frequencies or counts. (Input)
Elements of FRQ must be nonnegative.
TITLE — CHARACTER string containing main title. (Input)
Optional Arguments
NBAR – Number of bars. (Input)
If NBAR exceeds 100/(ISP + 1), then NBAR = 100/(ISP + 1) is used. NBAR must be positive.
Default: NBAR = size (FRQ,1).
ISP — Spacing between histogram bars. (Input)
ISP may be 0, 1, or 4.
Default: ISP= 4.
FORTRAN 90 Interface
Generic: CALL VHSTP (FRQ, TITLE [, …])
Specific: The specific interface names are S_VHSTP and D_VHSTP.
FORTRAN 77 Interface
Single: CALL VHSTP (NBAR, FRQ, ISP, TITLE)
Double: The double precision name is DVHSTP.
Description
VHSTP prints a vertical histogram on not more than one printer page using not more than 50 vertical and 100 horizontal print positions. Spacing control is allowed on the horizontal axis.
Given a vector containing positive counts, VHSTP determines the maximum count Tmax. Vertical printing position depends on K defined by K = 1 + (Tmax – 1)/50. If a frequency is greater than K, then a character is printed on the corresponding position of the first horizontal line from above. Henceforth, K is reduced by K/50 for each horizontal line, and frequencies are compared to the new K.
Comments
1. Informational errors
Type | Code | Description |
|---|
3 | 1 | ISP is out of range. ISP = 0 is used. |
3 | 3 | NBAR * (ISP + 1) is less than 1 or greater than 100. The width of the histogram is set to 100, and 100/(ISP + 1) bars are printed. The number of class intervals will be printed completely if ISP ≠ 0 and will always be printed up to and including 100/(ISP + 1) even though the histogram body is only 100 spaces wide. |
3 | 5 | The maximum value in the vector FRQ is less than 1; therefore, the body of the histogram is blank. |
3 | 6 | TITLE is too long. TITLE was truncated from the right side. |
2. Output is written to the unit specified by the routine UMACH (see the Reference Material section of this manual;).
3. TITLE is centered and placed at the top of the plot. The plot starts on a new page.
Example
Consider the data set in Example 1of the routine
OWFRQ (see
Chapter 1, "Basic Statistics".) This data set consists of the measurements (in inches) of precipitaion in Minneapolis/St. Paul during the month of March for 30 consecutive years. We use the routine
OWFRQ to create a one‑way frequency table. A vertical histogram is then generated using
VHSTP. A horizontal histogram for the same data set can be found in the document example for the routine .
USE UMACH_INT
USE OWFRQ_INT
USE VHSTP_INT
IMPLICIT NONE
INTEGER NBAR, NOBS
PARAMETER (NBAR=10, NOBS=30)
!
INTEGER IOPT, NOUT
REAL DIV(NBAR), TABLE(NBAR), X(NOBS), XHI, XLO
!
DATA X/0.77, 1.74, 0.81, 1.20, 1.95, 1.20, 0.47, 1.43, 3.37, &
2.20, 3.00, 3.09, 1.51, 2.10, 0.52, 1.62, 1.31, 0.32, 0.59, &
0.81, 2.81, 1.87, 1.18, 1.35, 4.75, 2.48, 0.96, 1.89, 0.90, &
2.05/
! Get output unit number
CALL UMACH (2, NOUT)
! Create a one-way frequency table from
! a given data set using intervals of
! equal length and user-supplied values
! of XLO and XHI
IOPT = 1
XLO = 0.5
XHI = 4.5
CALL OWFRQ (X, NBAR, TABLE, IOPT=IOPT, XLO=XLO, XHI=XHI, DIV=DIV)
WRITE (NOUT,99999) DIV, TABLE
99999 FORMAT (' Midpoints: ', 10F6.2, /, ' Counts: ', 10F6.0)
! Create the horizontal histogram
CALL VHSTP (TABLE, 'Plot of VHSTP')
END
Output
Midpoints: 0.25 0.75 1.25 1.75 2.25 2.75 3.25 3.75 4.25 4.75
Counts: 2. 7. 6. 6. 4. 2. 2. 0. 0. 1.
Plot of VHSTP
Frequency-------------------------------------------------------
7 * I *
6 * I I I *
5 * I I I *
4 * I I I I *
3 * I I I I *
2 * I I I I I I I *
1 * I I I I I I I I *
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