110824 DISCRETE Version: December 1985 Author: S. W. Provencher, Max-Planck-Inst.f.biophys.Chemie Submitted by: T. Hoshiko, Case Western Reserve University Operating System: RT-11 V5.01 Source Language: FORTRAN IV Memory Required: 24K Keywords: Mathematical Abstract: DISCRETE, originally written for the IBM 370, is a FORTRAN IV program for the automatic analysis of data represented by the sum: Y(k) = Summation [ A(j)*EXP(-LAM(j)*T(k)) ] for j = 0 to n and k = 1,2, . . . . , n, with n <= 9. Provision can be made for an unknown baseline component A(0) with LAM(0) = 0. Only the raw data (i.e., the Y(k) and T(k) are input; no potentially biased initial guesses at the A(j), LAM(j) or the number of exponential terms, n, are needed or allowed. Transforms of the data are used to obtain good starting estimates for least squares analyses of the data. DISCRETE is based on a fast and accurate method, making direct use of the knowledge that the data is being represented by a discrete sum (rather than an integral over a continuous distribution of exponentials). DISCRETE is large for a minicomputer and the original program required about 180Kbytes. Since the RT-11 single-job monitor accomodates only 45 Kbytes, substantial changes were required. The double precision version of DISCRETE had to be used requiring more space and time for execution so that this RT-11 version can accomodate only 50 points. Documentation available in hardcopy only. Media (Service Charge Code): User's Manual (EA), One RX01 Diskette (KA) Format: RT-11, 600' Magnetic Tape (MA) Format: RT-11

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