[Discuss-gnuradio] maxtrix inverse

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hi,

when i deal data in my block,i want to scramble the positions symbol in a frame,and  at receiver-end descramble these symbols,get correct  the order,for this purpose,i need to compute the inverse of  64*64 matrix,and when i used the eigen library ,it works slowly wnen compare with the  deal data speed of  gnuradio,anyone could give me some other libraries or other methods to satify my need,

thanks ,

BZS