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Hi gullipe and mikrom, Yes I use an inpit file in a form x, y1,y2,y3 what you have created. !!!!!!!!!!!!!!!!!! Input file: .000, .000, .000, .000 .100, .010, .000, .100 .200, .040, .003, .199 .300, .090, .009, .296 .400, .160, .021, .389 .500...

Hi, gullipe Thank you very much for the program. I tested and adapted it a little (I can not do much) for my further calculations.

Hi, gullipe, Thank you for the parabola method. Could you please to help me describing the following case, see below. Here the number of 'x' values is 'n' (i=1,n), I need to calculate dy1/dx, dy2/dx and dy3/dx with parabola method. I'm confused when describing the loops for i=1,n and for 'y'...

Hi, thanks for explanations. Where can find a program where derivatives are calculated directly from a data set x and y using spline? Such approach seems to be more accurate. But my programming level is not enough to program something like that. Thank's in advance

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...

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...

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