Coefficients and terms
So far we have managed to express the formulae as coefficients. However, there are constraints – for example SIN(A) ≤ 0.5 – which cannot be expressed directly using coefficients. The extended MPS format has a special reserved column name – the equals sign – which is effectively a variable with a fixed value of 1.0, and which can be used to hold formulae of any type, whether they can be expressed as coefficients or not. The area formula and distance constraints could all be written in a more readable form by using the "equals column". The area formula is rather long to write in this guide, but the distance constraints look like this:
= V1V2 RHO1 * RHO1 + RHO2 * RHO2 - 2 * RHO1 * RHO2 * COS ( THETA2 - THETA1 ) = V1V3 RHO1 * RHO1 + RHO3 * RHO3 - 2 * RHO1 * RHO3 * COS ( THETA3 - THETA1 )
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