Error using step() function

[Lourenco]

Hi, everyone.

When I execute:

    mm1 = tf(-.50405, [1 .98752] , -1)

And afterwards, execute:

    step(mm1)

It happens the following error:

    error: __stairs__: A(I,J): row index out of bounds; value 2 out of bound
1
    error: called from:
    error:   /usr/share/octave/3.6.2/m/plot/stairs.m at line 133, column 8
    error:   /usr/share/octave/3.6.2/m/plot/stairs.m at line 72, column 24
    error:   /usr/share/octave/packages/control-2.3.52/__time_response__.m
at line 175, column 13
    error:   /usr/share/octave/packages/control-2.3.52/step.m at line 67,
column 14


Does anybody knows how to overcome this issue?

Thanks in advance.



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