The perceptron algorithm was suggested by Polish American mathematician Andrzej Ehrenfeucht in order to create a matrix of weights which could distinguish true binding sites from other non-functional sites with similar sequences.
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A PWM has one row for each symbol of the alphabet: 4 rows for nucleotides in DNA sequences or 20 rows for amino acids in protein sequences.
The Matrix Reloaded | Matrix | Threat Matrix | The Weight | Hermitian matrix | Neo (The Matrix) | matrix metalloproteinase | matrix (mathematics) | matrix | Weight for Age | The Weight of Chains | Safety (American football position) | Safety (American and Canadian football position) | clerk (position) | Ceramic matrix composite | Weight Watchers | weight | Third Position | Supine position | Gross vehicle weight rating | Clerk (position) | Carry That Weight | Weight training | The Matrix Reloaded: The Album | The Matrix (production team) | The Matrix (music producer) | The Matrix (club) | Sheriff of Nottingham (position) | Multitrait-multimethod matrix | Matrix metalloproteinase |