I'm trying to find the equation of the curve (3d) to be able to calculate the velocity at any point in space, I couldn't find any function that I could perform to adjust the curve (like fit for 2D), My data set is taken from Excel files with more than 500 x 9 double, a part of the file follows below and each file has different number of lines.

X Y Z Vel

61.2566 -150.047 411 303.7

61.2521 -150.044 381 300

61.2478 -150.042 351 298.2

61.2435 -150.039 320 292.6

61.2392 -150.037 297 294.5

Thanks for any help…

Juliano

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