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SHEARFIND - Shears for transformation of a general lattice to separable

Usage

[s0,s1,br] = shearfind(L,a,M,lt);

Description

[s0,s1,br]=shearfind(L,a,M,lt) computes three numbers, the first two represent a frequency and time shear respectively. With the returned choices of \(s_0\) and \(s_1\) one can transform an initial lattice given by a, M and lt into a separable (rectangular) lattice given by

\begin{equation*} a_r = \frac{aL}{b_rM},\quad M_r=\frac{L}{b_r}. \end{equation*}

If \(s_0\) is non-zero, the transformation from general to separable lattice requires a frequency-side shear. Similarly, if \(s_1\) is non-zero, a time-side shear is required.