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semilogypn
Semilogarithmic plot for positive and negative data.
Description `

    semilogypn(...) is the same as SEMILOGY(...), except that the Y data
    may have positive and negative values. This is useful to detect
    unexpected negative values in the Y data (causing repeated 'Negative
    data ignored' warnings), or to visualize the magnitude of an
    oscillating signal in log scale.

    semilogypn(X,Y) plots X versus Y as logarithmic scales, where Y may
    have positive and negative values. By default, negative values are
    ploted with dashed lines and positive values with full lines. If X is
    not specified, Y is plotted versus its index.

    semilogypn(X,Y,LineSpecPos,LineSpecNeg) specifies LineSpecPos and
    LineSpecNeg for the line types, marker symbols and colors for the
    positive and negative values of Y. For instance,
    semilogypn(X,Y,'ro-','b*') plots the positive Y with red line and 'o'
    markers and the negative Y with blue stars '*'.

    semilogypn(X,Y,LineSpecPos,LineSpecNeg,'PropertyName',PropertyValue,...)
    sets property values for all lineseries graphics objects created by
    semilogypn. See the line reference page for more information.

    [HP, HN] = semilogypn(...) returns the handles to the two lineseries
    graphics objects.

Example

       x = linspace(1,10,200);
       y = sin(x*2)./x;
       semilogypn(x,y,'r.','bo');
       axis([1 10 1e-2 1]);

       semilogypn(x,y,'b-','r:','LineWidth',2);

       [hp, hn] = semilogypn(x,y,'k');
       set(hp, 'LineWidth', 1);
       set(hn, 'LineWidth', 2);

See Also

    SEMILOGY, LOGLOG, loglogpn.

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