PLOTLG is a very simple routine which plots a single curve defined in x,y with log and/or linear\ scaling including appropriate axes and plot title. Various options select the format of plotting and type of grid.
CALL PLOTLG(x,y,n,iflag,xl,yl,xt,nxt,yt,nyt,t,nt, <xm,xx,ym,yx<<,ic>,l>>) x (R): array of x values y (R): array of y values n (I): number of points in x array iflag (I): option flag < 0 : do not close LONGLIB after plotting = 0 : close LONGLIB--no plot produced > 0 : close LONGLIB after plotting (magnitude) > 10000 : do not initialize LONGLIB before plotting (1's digit) = 1 : plot x linear, y logarithmic (base 10) = 2 : plot x logarithmic, y linear = 3 : plot x logarithmic, y logarithmic = 4 : plot x linear, y linear (10's digit) = 0 : no axes or title plotted = 1 : axes with axis line/ticks on top and sides = 2 : plot solid cartesian grid = 3 : plot ticked cartesian grid without box = 4 : plot ticked cartesian grid with box = 5 : ticked cartesian grid, box w/axis ticks = 6 : plot without box or grid = 7 : plot solid logarithmic grid = 8 : plot dotted logarithmic grid = 9 : plot ticked logarithmic grid (100's) = 0 : Ask which screen device to use <> 0 : Screen Device Number (see FRAME) xl (R): x axis length in inches (integer-valued) < 0 : use input scaling in xm,xx > 0 : use auto scaling computed from input array yl (R): y axis length in inches (integer-valued) < 0 : use input scaling in ym,yx > 0 : use auto scaling computed from input array xt (C): x axis title string nxt (I): number of characters in xt < 0 : axis ticks on top of x axis = 0 : no axis > 0 : axis ticks on bottom of x axis (normal) yt (C): y axis title string nyt (I): number of characters in yt < 0 : axis ticks on right of y axis = 0 : no axis > 0 : axis ticks on left of y axis (normal) t (C): plot title string (limited to 99 characters) nt (I): number of characters in t < 0 : use color array = 0 : no title > 0 : do not use color array if |nt|/100 > 0 : use line type list xm (R): minimum value of x array (accessed if xl or nt < 0) xx (R): maximum value of x array (accessed if xl or nt < 0) ym (R): minimum value of y array (accessed if xl, yl or nt<0) yx (R): maximum value of y array (accessed if xl, yl or nt<0) (NOTE: optional color array accessed if nt<0 or |nt|/100>0) ic (I): color array ic(1) : color for grid ic(2) : color for axis lines ic(3) : color for axis numbers ic(4) : color for axis titles ic(5) : color for axis exponents ic(6) : color for plotted line ic(7) : color for title (return) (NOTE: optional line type array only accessed if |nt|/100>0) l (I): line type of data line if |nt|/100 > 0 : use line type list common /cplotlg/xmr,dxr,ymr,dyr xmr (R): returned value of xmin dxr (R): returned value of scale factor (xmax-xmin)/xlen ymr (R): returned value of ymin dyr (R): returned value of scale factor (ymax-ymin)/ylen