By R. A. Ashen
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5) The special case of a pure imaginary number (A = 0) causes the p r o g r a m to branch to line 230. c. circuit analysis sible divide by zero. From lines 230 to 270, the sign of B is tested to determine whether the angle is + 90°, — 90°, or 0° (if B is also zero). (6) Most of the complexity of this p r o g r a m results from the limitations of the standard ATN, function supplied in BASIC. M o r e advanced computer languages contain a four-quadrant version of the function, which would considerably simplify the resulting program.
T h e selfadmittances are the algebraic sums of all the admittances connected to the appropriate node. T h e mutual admittance between two nodes is the total admittance between the two, with the sign reversed. T h e currents are the algebraic sums of the current sources feeding into the appropriate node. Hence, a nett outward current at a node is negative. The similarity between the mesh current a n d node voltage equations should be noted. This mathematical correspondence between differing representations of quantities in the same engineering discipline is called duality.
4) At line 190, the angle for a second q u a d r a n t complex number is evaluated. The corresponding calculation for a third q u a d r a n t number is performed at line 210. (5) The special case of a pure imaginary number (A = 0) causes the p r o g r a m to branch to line 230. c. circuit analysis sible divide by zero. From lines 230 to 270, the sign of B is tested to determine whether the angle is + 90°, — 90°, or 0° (if B is also zero). (6) Most of the complexity of this p r o g r a m results from the limitations of the standard ATN, function supplied in BASIC.