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  1. modelling

    calculation of derivatives from a data set

    Hi, I have a data set like x[1],..,x[i],..,x[n] y[1],..,y[i],..,y[n] But there is no function like y = f(x), it is unknown, and the step between the x values is not constant. x values are calculated separately from y, but finally i have to find partial derivative like dy/dx. Can I calculate it...
  2. modelling

    calculation ov derivatives from a data set

    Hi, I am looking for a program in Fortran 90/95 to calculate derivatives from a data set. Please help me. Thank you in advance. Di

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