Function demo_syncDiagMatr

examples/isolated/initialising_matrices.cpp:336–349

void demo_syncDiagMatr() {

    DiagMatr a = createDiagMatr(2);

    // manually modify the elems
    a.cpuElems[0] = 1;
    a.cpuElems[1] = 2_i;
    a.cpuElems[2] = -3_i;
    a.cpuElems[3] = -2+4_i;

    syncDiagMatr(a);
    reportDiagMatr(a);
    destroyDiagMatr(a);
}