NAME: fourfunc PURPOSE: Compute a Fourier series function (called by fourfit) DESCRIPTION: This is to be used in cases where you already know the fundamental period. The input independent variable is assumed to be reduced to phase of a fundamental period already. The integer part of the number is not to the function. CATEGORY: Mathematical CALLING SEQUENCE: fourfunc,x,c,f,pder INPUTS: x - independent variable (phase, between zero and one) c - fourier series coefficients 0 - a(0) -> constant term 1 - a(1) -> cos(x2pi) 2 - b(1) -> sin(x2pi) 3 - a(2) -> cos(2x2pi) 4 - b(2) -> sin(2x2pi) and so on for as many elements as in c OPTIONAL INPUT PARAMETERS: KEYWORD INPUT PARAMETERS: OUTPUTS: f - Evaluated function value pder - (Optional) partial derivatives KEYWORD OUTPUT PARAMETERS: COMMON BLOCKS: SIDE EFFECTS: RESTRICTIONS: PROCEDURE: MODIFICATION HISTORY: 94/10/10, Written by Marc W. Buie, Lowell Observatory