Calling sequence of calc_scale

The calling sequence for calc_scale is:

result = calc_scale(t,$\Omega_M$, $\Omega_\Lambda$,w=y)

where y is a value for w ( $-1 \leq y \leq 0$). t is the time in terms of H₀. For times in the past, t has to be negative, t = 0 is the present and positive t values describe points in the future. t can be a scalar or an array. If it is a scalar, result is a scalar scale factor. If t is an array, result is an array with the scale factor for each t value in the array. The parameters $\Omega_M$, $\Omega_\Lambda$ must be specified, whereas w can be omitted. In the current version, w isn't used for the calculation. If w is omitted, it is internally set to -1 (which has no effect in the current version because it doesn't enter the calculation).