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showslope
Draw a line with fixed slope
Description `

    showslope(N) drags a line in the current figure with a fixed slope N
    (does not work with docked windows; undock your window first!)

    Depending of the axis types, the 'slope' N means:
         Y = N*X+A         for X linear and Y linear
         Y = A*X^N         for X log and Y log
         Y = A*EXP(N*X)    for X linear and Y log
         Y = A+N*LOG(X)    for X log and Y linear (LOG = natural logarithm)

    The value N is displayed close to the line. N may also be the string of
    any valid Matlab expression (eg, 'pi', '22/7', ...), which will be
    displayed close to the line. showslope(N,'nolabel') does not display
    the value N in the figure.

    H = showslope(..) also returns a handle to the line.

    By default, the line is an 'annotation object', ie: it is attached to
    the window and not to the figure axes. As a consequence, the line may
    be further moved, or may be used for getslope. However, resizing
    the window may in some case shift the line, and turning the axes from
    lin to log turns a power law to a log law... To avoid these problems,
    specify showslope(N,'fix'), which makes the line a real plot object
    attached to the figure axes.

See Also

    getslope, plotsample.

`

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