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<p>Computes double precision complex z = alpha*A*x + beta*y, with A stored in Diagonal Format on GPU. </p><dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">handle</td><td>The spgpu handle used to call this routine </td></tr>
    <tr><td class="paramname">z</td><td>The output vector of the routine. z could be y, but not y + k (i.e. an overlapping area over y, but starting from a base index different from y). </td></tr>
    <tr><td class="paramname">y</td>