Electronic graph drawing apparatus

Claim 1

An electronic graph drawing apparatus comprising: input means for introducing a plurality of numerical data values desired to be graphed; first memory means, responsive to said input means, for storing said introduced numerical data values; second memory means for storing graph drawing information including maximum scale information and number of divisions for a plurality of graph classes, each said graph class corresponding to a class range of values of maximum data to be printed; and processor means for producing graph scale data from said plurality of numerical data values, said processor means using stored logic programs, and comprising, maximum value selection means for determining the maximum data value of said plurality of numerical data values stored in said first memory means, means, responsive to said maximum value selection means, for comparing said maximum data value selected thereby to said class range of values corresponding to each said graph class as stored in said second memory means, and for selecting said graph class having a class range of values within which said maximum data falls, means, responsive to selection of said graph class by said means for comparing and selecting, for recalling said graph drawing information from said second memory means, and means, responsive to said graph drawing information from means for recalling, for reading said numerical data values from said first memory means and for printing a graph in said selected graph class of said plurality of data values, said means for reading and printing further printing scale indicia and scale lines.