python-control / python-control / 162

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Pull #126

travis-ci

BugFix: DC gain for discrete-time systems

For discrete time systems the DC gain is found at z=1; change dcgain
method in TransferFunction and StateSpace classes for this.

Added tests for static gain, low-pass filter, differencer and
summer for both classes.

If the StateSpace DC gain computation fails due to singularity, return
an array of NaNs of size (output,input), rather than scalar NaN.  Added
separate test for this for continuous- and discrete-time cases.

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