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loglogpn
Log-log scale plot for positive and negative data.
Description `

    loglogpn(...) is the same as LOGLOG(...), 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.

    loglogpn(X,Y) plots X versus Y in log-log scale, 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.

    loglogpn(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,
    loglogpn(X,Y,'ro-','b*') plots the positive Y with red line and 'o'
    markers and the negative Y with blue stars '*'. If only LineSpecPos
    is specified, the same is taken for LineSpecNeg, with a different
    LineStyle.

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

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

Examples

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

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

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

See Also

    LOGLOG, SEMILOGY, semilogypn.

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