9 lines
213 B
Text
9 lines
213 B
Text
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(* Fibonacci numbers with memoization *)
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fib::usage = "f[n] calculates the n'th Fibonacci number.";
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fib[0] = fib[1] = 1;
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fib[n_Integer?Positive]:= fib[n] = fib[n-1] + fib[n-2];
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In[4]:= fib[42]
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Out[4]= 433494437
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