Midwestern Univ. Res. Ass.

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MAC-ILLIAC KEY TO DIGITAL COMPUTER PHOTOGRAPHS The differential equations which are being solved ares tt x = nx - e x3 -f- e x y2-r y It-- -ny - e y3 +-e y x2 3 See Powell }!AC-JLP-l There are 20 Runge-Kutta steps per sector (one focussing and one defocussing lens) and the computer can print a point at each step or at specified intervals from the beginning. The x motion starts at the entrance to a defocus sing lens and the y motion always starts at the entrance of a focussinB lens therefore, 27i20 h -_- N where N is the number of sectors in the machine. Thus h 1s the number of radians between printed points. The code stops if x ).5 or Y )-5 The code can take 0 < n <. 2000 The code can take 0 ( e (2000 The code Can take 0 <. h <._03 The axes have extent -= .5 and 256 R-K steps on the horizontal axis. 

Key to digital computer photographs

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