Trigonometric TimeSeries

This command is used to construct a TimeSeries object in which the load factor is some trigonemtric function of the time in the domain <math> \lambda = f(t) = \begin{cases}

\text{cFactor} * sin (\frac{2.0 \Pi (t-tStart)}{\text{period}} + \text{shift}), &\text{tStart} <= t <= \text{tEnd}\\
\text{0.0}, &\text{otherwise}\\

\end{cases}

</math>

uniaxialMaterial Rectangular tag? tStart? tEnd? period? <-factor $cFactor> <-shift shift>

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$tag	unique tag among TimeSeries objects.
$tStart	starting time of non-zero load factor
$tEnd	ending time of non-zero load factor
$period	characteristic period of sine wave
$shift	phase shift in radians (optional, default=0.0)
$cFactor	the load factor amplification factor (optional, default=1.0)

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Code Developed by: fmk