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1 ### Copyright (C) 1996 John W. Eaton |
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2 ### |
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3 ### This file is part of Octave. |
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4 ### |
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5 ### Octave is free software; you can redistribute it and/or modify it |
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6 ### under the terms of the GNU General Public License as published by |
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7 ### the Free Software Foundation; either version 2, or (at your option) |
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8 ### any later version. |
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9 ### |
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10 ### Octave is distributed in the hope that it will be useful, but |
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11 ### WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 ### General Public License for more details. |
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14 ### |
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15 ### You should have received a copy of the GNU General Public License |
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16 ### along with Octave; see the file COPYING. If not, write to the Free |
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17 ### Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
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18 ### 02111-1307, USA. |
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19 |
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2311
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20 ## usage: [xb, yb] = bar (x, y) |
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21 ## |
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22 ## Given two vectors of x-y data, bar produces a `bar' graph. |
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23 ## |
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24 ## If only one argument is given, it is taken as a vector of y-values |
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25 ## and the x coordinates are taken to be the indices of the elements. |
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26 ## |
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27 ## If two output arguments are specified, the data are generated but |
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28 ## not plotted. For example, |
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29 ## |
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30 ## bar (x, y); |
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31 ## |
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32 ## and |
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33 ## |
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34 ## [xb, yb] = bar (x, y); |
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35 ## plot (xb, yb); |
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36 ## |
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37 ## are equivalent. |
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38 ## |
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39 ## See also: plot, semilogx, semilogy, loglog, polar, mesh, contour, |
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40 ## stairs, gplot, gsplot, replot, xlabel, ylabel, title |
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41 |
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2311
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42 function [xb, yb] = bar (x, y) |
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43 |
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44 if (nargin == 1) |
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45 if (is_vector (x)) |
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46 len = 3 * length (x) + 1; |
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47 tmp_xb = tmp_yb = zeros (len, 1); |
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48 tmp_xb(1) = 0.5; |
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49 tmp_yb(1) = 0; |
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50 k = 1; |
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51 for i = 2:3:len |
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52 tmp_xb(i) = k-0.5; |
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53 tmp_xb(i+1) = k+0.5; |
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54 tmp_xb(i+2) = k+0.5; |
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55 tmp_yb(i) = x(k); |
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56 tmp_yb(i+1) = x(k); |
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57 tmp_yb(i+2) = 0.0; |
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58 k++; |
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59 endfor |
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60 else |
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61 error ("bar: argument must be a vector"); |
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62 endif |
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63 elseif (nargin == 2) |
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64 if (is_vector (x) && is_vector (y)) |
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65 xlen = length (x); |
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66 ylen = length (y); |
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67 if (xlen == ylen) |
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68 len = 3 * xlen + 1; |
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69 tmp_xb = tmp_yb = zeros (len, 1); |
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70 delta = (x(2) - x(1)) / 2.0; |
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71 tmp_xb(1) = x(1) - delta; |
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72 tmp_yb(1) = 0.0; |
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73 k = 1; |
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74 for i = 2:3:len |
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75 tmp_xb(i) = tmp_xb(i-1); |
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76 tmp_xb(i+1) = tmp_xb(i) + 2.0 * delta; |
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77 tmp_xb(i+2) = tmp_xb(i+1); |
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78 tmp_yb(i) = y(k); |
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79 tmp_yb(i+1) = y(k); |
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80 tmp_yb(i+2) = 0.0; |
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81 if (k < xlen) |
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82 delta = (x(k+1) - x(k)) / 2.0; |
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83 if (x(k+1) < x(k)) |
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84 error ("bar: x vector values must be in ascending order"); |
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85 endif |
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86 endif |
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87 k++; |
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88 endfor |
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89 else |
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90 error ("bar: arguments must be the same length"); |
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91 endif |
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92 else |
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93 error ("bar: arguments must be vectors"); |
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94 endif |
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95 else |
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96 usage ("[xb, yb] = bar (x, y)"); |
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97 endif |
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98 |
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99 if (nargout == 0) |
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100 plot (tmp_xb, tmp_yb); |
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101 else |
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102 xb = tmp_xb; |
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103 yb = tmp_yb; |
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104 endif |
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105 |
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106 endfunction |
