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Two General Computer Programs for Drawing Graphs of Histograms, Data Points, and Linear and Quadratic Functions on Calcomp Drum Plotters 1
Author(s) -
Wallingford G. W.,
Vanderlip R. L.,
Meiners J. H.,
Kemp K. E.
Publication year - 1974
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1974.00021962006600030043x
Subject(s) - plotter , fortran , subdivision , computer science , computer graphics (images) , computer program , generality , drum , programming language , engineering drawing , algorithm , engineering , mechanical engineering , psychology , civil engineering , psychotherapist
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=AX 2 +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.