Mercurial > repos > public > sbplib
comparison +grid/primalDual1D.m @ 641:070d578997f6 feature/d1_staggered
Add helper function for primal and dual 1D staggered grid, and a test for that function.
| author | Martin Almquist <malmquist@stanford.edu> |
|---|---|
| date | Sat, 11 Nov 2017 20:26:37 -0800 |
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| 640:4046b046c1f7 | 641:070d578997f6 |
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| 1 % Creates a 1D staggered grid of dimension length(m). | |
| 2 % over the interval xlims | |
| 3 % Primal grid: equidistant with m points. | |
| 4 % Dual grid: m + 1 points, h/2 spacing first point. | |
| 5 % Examples | |
| 6 % g = grid.primal_dual_1D(m, xlim) | |
| 7 % g = grid.primal_dual_1D(11, {0,1}) | |
| 8 function [g_primal, g_dual] = primalDual1D(m, xlims) | |
| 9 | |
| 10 if ~iscell(xlims) || numel(xlims) ~= 2 | |
| 11 error('grid:primalDual1D:InvalidLimits','The limits should be cell arrays with 2 elements.'); | |
| 12 end | |
| 13 | |
| 14 if xlims{1} > xlims{2} | |
| 15 error('grid:primalDual1D:InvalidLimits','The elements of the limit must be increasing.'); | |
| 16 end | |
| 17 | |
| 18 xl = xlims{1}; | |
| 19 xr = xlims{2}; | |
| 20 h = (xr-xl)/(m-1); | |
| 21 | |
| 22 % Primal grid | |
| 23 g_primal = grid.equidistant(m, xlims); | |
| 24 g_primal.h = h; | |
| 25 | |
| 26 % Dual grid | |
| 27 x = [xl; linspace(xl+h/2, xr-h/2, m-1)'; xr]; | |
| 28 g_dual = grid.Cartesian(x); | |
| 29 g_dual.h = h; | |
| 30 end |