Mercurial > matrix-functions
comparison matrixcomp/cpltaxes.m @ 0:8f23314345f4 draft
Create local repository for matrix toolboxes. Step #0 done.
| author | Antonio Pino Robles <data.script93@gmail.com> |
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| date | Wed, 06 May 2015 14:56:53 +0200 |
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| -1:000000000000 | 0:8f23314345f4 |
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| 1 function x = cpltaxes(z) | |
| 2 %CPLTAXES Determine suitable AXIS for plot of complex vector. | |
| 3 % X = CPLTAXES(Z), where Z is a complex vector, | |
| 4 % determines a 4-vector X such that AXIS(X) sets axes for a plot | |
| 5 % of Z that has axes of equal length and leaves a reasonable amount | |
| 6 % of space around the edge of the plot. | |
| 7 | |
| 8 % Called by FV, GERSH, PS and PSCONT. | |
| 9 | |
| 10 % Set x and y axis ranges so both have the same length. | |
| 11 | |
| 12 xmin = min(real(z)); xmax = max(real(z)); | |
| 13 ymin = min(imag(z)); ymax = max(imag(z)); | |
| 14 | |
| 15 % Fix for rare case of `trivial data'. | |
| 16 if xmin == xmax, xmin = xmin - 1/2; xmax = xmax + 1/2; end | |
| 17 if ymin == ymax, ymin = ymin - 1/2; ymax = ymax + 1/2; end | |
| 18 | |
| 19 if xmax-xmin >= ymax-ymin | |
| 20 ymid = (ymin + ymax)/2; | |
| 21 ymin = ymid - (xmax-xmin)/2; ymax = ymid + (xmax-xmin)/2; | |
| 22 else | |
| 23 xmid = (xmin + xmax)/2; | |
| 24 xmin = xmid - (ymax-ymin)/2; xmax = xmid + (ymax-ymin)/2; | |
| 25 end | |
| 26 axis('square') | |
| 27 | |
| 28 % Scale ranges by 1+2*alpha to give extra space around edges of plot. | |
| 29 | |
| 30 alpha = 0.1; | |
| 31 x(1) = xmin - alpha*(xmax-xmin); | |
| 32 x(2) = xmax + alpha*(xmax-xmin); | |
| 33 x(3) = ymin - alpha*(ymax-ymin); | |
| 34 x(4) = ymax + alpha*(ymax-ymin); | |
| 35 | |
| 36 if x(1) == x(2), x(2) = x(2) + 0.1; end | |
| 37 if x(3) == x(4), x(4) = x(3) + 0.1; end |