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1 ## Copyright (C) 1996, 1997 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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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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42 ## Author: jwe |
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43 |
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44 function [xb, yb] = bar (x, y) |
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45 |
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46 if (nargin == 1) |
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47 if (is_vector (x)) |
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48 len = 3 * length (x) + 1; |
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49 tmp_xb = tmp_yb = zeros (len, 1); |
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50 tmp_xb(1) = 0.5; |
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51 tmp_yb(1) = 0; |
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52 k = 1; |
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53 for i = 2:3:len |
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54 tmp_xb(i) = k-0.5; |
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55 tmp_xb(i+1) = k+0.5; |
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56 tmp_xb(i+2) = k+0.5; |
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57 tmp_yb(i) = x(k); |
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58 tmp_yb(i+1) = x(k); |
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59 tmp_yb(i+2) = 0.0; |
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60 k++; |
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61 endfor |
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62 else |
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63 error ("bar: argument must be a vector"); |
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64 endif |
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65 elseif (nargin == 2) |
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66 if (is_vector (x) && is_vector (y)) |
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67 xlen = length (x); |
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68 ylen = length (y); |
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69 if (xlen == ylen) |
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70 len = 3 * xlen + 1; |
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71 tmp_xb = tmp_yb = zeros (len, 1); |
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72 cutoff = zeros (1, xlen-1); |
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73 for i = 1:xlen-1 |
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74 cutoff(i) = (x(i) + x(i+1)) / 2.0; |
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75 endfor |
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76 delta_p = cutoff(1) - x(1); |
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77 delta_m = delta_p; |
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78 tmp_xb(1) = x(1) - delta_m; |
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79 tmp_yb(1) = 0.0; |
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80 k = 1; |
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81 for i = 2:3:len |
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82 tmp_xb(i) = tmp_xb(i-1); |
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83 tmp_xb(i+1) = x(k) + delta_p; |
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84 tmp_xb(i+2) = tmp_xb(i+1); |
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85 tmp_yb(i) = y(k); |
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86 tmp_yb(i+1) = y(k); |
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87 tmp_yb(i+2) = 0.0; |
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88 if (k < xlen) |
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89 if (x(k+1) < x(k)) |
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90 error ("bar: x vector values must be in ascending order"); |
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91 endif |
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92 delta_m = x(k+1) - cutoff(k); |
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93 k++; |
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94 if (k < xlen) |
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95 delta_p = cutoff(k) - x(k); |
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96 else |
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97 delta_p = delta_m; |
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98 endif |
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99 endif |
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100 endfor |
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101 else |
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102 error ("bar: arguments must be the same length"); |
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103 endif |
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104 else |
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105 error ("bar: arguments must be vectors"); |
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106 endif |
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107 else |
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108 usage ("[xb, yb] = bar (x, y)"); |
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109 endif |
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110 |
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111 if (nargout == 0) |
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112 plot (tmp_xb, tmp_yb); |
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113 else |
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114 xb = tmp_xb; |
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115 yb = tmp_yb; |
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116 endif |
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117 |
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118 endfunction |
