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Annotation of researchv10dc/vol2/grap/ode1.g, revision 1.1.1.1

1.1       root        1: .G1
                      2: frame ht 2.5 wid 2.5
                      3: coord x 0,1 y 0,1
                      4: label bot "Direction field is $y sup prime = x sup 2 / y$"
                      5: label left "$y = sqrt {(2x sup 3 +1)/3}$" right .3
                      6: ticks left in 0 at 0,1
                      7: ticks bot in 0 at 0,1
                      8: len = .04
                      9: for tx from .01 to .91 by .1 do {
                     10:        for ty from .01 to .91 by .1 do {
                     11:                deriv = tx*tx/ty
                     12:                scale = len/sqrt(1+deriv*deriv)
                     13:                line from tx,ty to tx+scale,ty+scale*deriv
                     14:        }
                     15: }
                     16: draw solid
                     17: for tx = 0 to 1 by .05 do {
                     18:        next at tx, sqrt((2*tx*tx*tx+1)/3)
                     19: }
                     20: .G2

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