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