fix the interface
change the trace calculator to derive from gr_block instead of gr_sync_decimator
typo
typo
debug
forget consume input items
remove debugging printf
test
test the trace in real streaming
tab issues
test the time for calculate the sample covariance matrix.
use diff time of clock
try to use the clock_gettime to test the time
fix error
debug
to see if the -lrt is really working in CMakeLists.txt
add fprintf to stderr
implementing the eigen value block
add gr_block.h
test the eigen value