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This article in AJ

  1. Vol. 66 No. 3, p. 468-470
    Received: Oct 1, 1973

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Two General Computer Programs for Drawing Graphs of Histograms, Data Points, and Linear and Quadratic Functions on Calcomp Drum Plotters1

  1. G. W. Wallingford,
  2. R. L. Vanderlip,
  3. J. H. Meiners and
  4. K. E. Kemp2



Mechanical plotting machines can present data rapidly and inexpensively if the available computer programs are general enough to handle a wide variety of data. Two FORTRAN IV, level G, programs were written for use with CALCOMP drum pen-plotters. One program plots functions of the form Y=AX2+BX+C, including the individual data points. The other program plots histograms, which the user designs by dividing the bottom axis into subdivisions and stating the number of bars with different thatch designs to appear in each subdivision. Both of these programs allow the user to create graphs of any rectangular size with extensive labeling. Numerous options and the generality of the programs permit most data, without alteration, to be plotted in a final, publishable form.

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