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<br />The methods of ent-ering the graph dimensions include: <br /> <br />(a) Using "USER" mode input, the following card (or record <br />or line) can be entered: <br /> <br />GXMIN,2,GXMAX,15,GYMIN,l,GYMAX,lO <br /> <br />; ! <br /> <br />(b) Using "FORMATTEO" mode input, the "PS. card shoul d <br />be entered. <br /> <br />3. Scaling. <br />The user can exert as much or as little influence on the graph scaling <br />as he/She desires. If the user does nothing, the program examines the data to <br />determine the maximlll1 and minimum data values, and then detennines a "nice" <br />scale (virtual minimum and maximum). At the other end of the spectrum, the <br />user may specify the nrinimum and the maximum virtual data points to fix the <br />graph scale. In between these two extremes, the user may speci fy on ly a <br />value of .virtual data units per division". The default nuntler of divisions <br />is simply the number of integral inches between the maximum and minimum <br />device coordinates. Thus, for the default case,. the number of x-axis divisions <br />equals: <br /> <br />. <br />orvx . [GXMAX - GXMIN] . [12.5 - 0] . ]2 <br /> <br />. <br />where. [X] indicates the integral part of X <br /> <br />For the recommended CALCOMP limits at BKY, the following occurs: <br /> <br />. . <br />orvx . [GXMAX - GXMIN] . [15.0 - 2.0] '" 13 <br /> <br />Thus, for Calcomp, the result of specifying virtual units per division is <br />equivalent to virtual units per inch. <br /> <br />There are several ways to enter scaling specifications. Variables used to <br />control the virtual units per division specification include: <br /> <br />. <br /> <br />XAUPI - to enter x~axis value which will apply to ~ graphs <br />plotted within this particular job. <br /> <br />~ <br /> <br />16 <br /> <br />.. <br />