Mercurial > matrix-functions

annotate toolbox/cpltaxes.m @ 2:c124219d7bfa draft

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Re-add the 1995 toolbox after noticing the statement in the ~higham/mctoolbox/ webpage.
author Antonio Pino Robles <data.script93@gmail.com>
date Thu, 07 May 2015 18:36:24 +0200
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children
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8f23314345f4 Create local repository for matrix toolboxes. Step #0 done.
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1 function x = cpltaxes(z)
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2 %CPLTAXES Determine suitable AXIS for plot of complex vector.
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3 % X = CPLTAXES(Z), where Z is a complex vector,
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4 % determines a 4-vector X such that AXIS(X) sets axes for a plot
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5 % of Z that has axes of equal length and leaves a reasonable amount
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6 % of space around the edge of the plot.
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8 % Called by FV, GERSH, PS and PSCONT.
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10 % Set x and y axis ranges so both have the same length.
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12 xmin = min(real(z)); xmax = max(real(z));
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13 ymin = min(imag(z)); ymax = max(imag(z));
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15 % Fix for rare case of `trivial data'.
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16 if xmin == xmax, xmin = xmin - 1/2; xmax = xmax + 1/2; end
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17 if ymin == ymax, ymin = ymin - 1/2; ymax = ymax + 1/2; end
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19 if xmax-xmin >= ymax-ymin
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20 ymid = (ymin + ymax)/2;
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21 ymin = ymid - (xmax-xmin)/2; ymax = ymid + (xmax-xmin)/2;
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22 else
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23 xmid = (xmin + xmax)/2;
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24 xmin = xmid - (ymax-ymin)/2; xmax = xmid + (ymax-ymin)/2;
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25 end
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26 axis('square')
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28 % Scale ranges by 1+2*alpha to give extra space around edges of plot.
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30 alpha = 0.1;
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31 x(1) = xmin - alpha*(xmax-xmin);
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32 x(2) = xmax + alpha*(xmax-xmin);
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33 x(3) = ymin - alpha*(ymax-ymin);
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34 x(4) = ymax + alpha*(ymax-ymin);
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36 if x(1) == x(2), x(2) = x(2) + 0.1; end
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37 if x(3) == x(4), x(4) = x(3) + 0.1; end