c_csa3ls(3NCARG)

💖 c_csa3ls — cubic spline approximation, simple entry for three-dimensional input, list output ✨

okay bestie, welcome to c_csa3ls, a lil function from the NCAR GRAPHICS manual, section 3NCARG 🦋. she's giving "fit a smooth 3D spline to your scattered vibes and hand you back a list of answers," and honestly? she ate.

🌸 FUNCTION PROTOTYPE 🌸

float *c_csa3ls(int, float [], float [], float [], float [],
                int [], int, float [], float [], float[], int *);

✨ SYNOPSIS ✨

float *c_csa3ls(int n, float xi[], float yi[], float zi[], float ui[],
                int knots[3], int no, float xo[], float yo[], float zo[],
                int *);

🎀 DESCRIPTION 🎀

here's the tea on every single argument, no skips, no skimming, we're doing this properly 💅

• n (integer, input) — how many input data points you're feeding in. it has to be greater than 3, and depending on the size of knots below, n may have to be even bigger. so like, mind the vibes.
• xi (real, input) — an array dimensioned for n, holding the X coordinate values of your input function.
• yi (real, input) — an array dimensioned for n, holding the Y coordinate values of your input function.
• zi (real, input) — an array dimensioned for n, holding the Z coordinate values of your input function.
• ui (real, input) — the array of functional values. ui[k] is the functional value at (xi[k], yi[k], zi[k]) for k=0,n-1. iconic.
• knots (integer, input) — how many knots go into building the approximation spline. knots[0], knots[1], and knots[2] must each be at least 4. the bigger knots is, the closer the approximated curve gets to passing through your input function values. more knots = more snuggle 🫶
• no (integer, input) — the number of X - Y coordinate values to be calculated for the output array.
• xo (real, input) — an array dimensioned for no, holding the X coordinates of the output list.
• yo (real, output) — an array dimensioned for no, holding the Y coordinates of the output list.
• zo (real, output) — an array dimensioned for no, holding the Z coordinates of the output list.
• ier (pointer to integer, output) — the error return value. if *ier comes back as 0, no errors were detected, we love a clean run 😌. if *ier is non-zero, go check the error list in the error table for the details. don't ignore her, she's telling you something.

🌈 USAGE 🌈

so you call c_csa3ls when you want values of an approximating cubic spline at specified three-dimensional coordinates. periodt. ✨

but heads up bestie — if you wanna weight the input data values, calculate derivatives, or handle data sparse areas specially, then c_csa3ls is not your girl. you're gonna need c_csa3lxs. iykyk.

c_csa3ls returns a pointer to a linear array of data containing the approximated values calculated at the input list of coordinate values. so like, if out is declared as:

float *out;

and we set:

out = c_csa3ls(n, x, y, z, u, knots, no, xo, yo, zo, &ier);

then out[i] is the approximated function value at coordinate point (xo[i], yo[i], zo[i]) for 0 <= i < no. the space for out is allocated internal to c_csa3ls and is no floats in size. she allocates for you, main character energy fr fr 👑

💜 ACCESS 💜

to use c_csa3ls, load the NCAR Graphics library ngmath.

🦋 SEE ALSO 🦋

• csagrid
• c_csa3s
• c_csa3xs
• c_csa3lxs

complete documentation for Csagrid is available at URL http://ngwww.ucar.edu/ngdoc/ng/ngmath/csagrid/csahome.html

👑 COPYRIGHT 👑

Copyright (C) 2000 University Corporation for Atmospheric Research

the use of this Software is governed by a License Agreement.

ok that's the whole page, you understood all of it, i'm so proud of you 🥹💖

and that's a wrap on this UNIX manual page, c_csa3ls(3NCARG), dated January 1999. mwah, go forth and spline responsibly 🌸✨🎀