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2 58 Examples and outline Some MEX examples are in the directory extern/examples/refbook found in the main MATLAB installation directory. These are discussed in the online “External Interfaces” manual. To try them, follow the instructions in the manual. The gateway always begins with the line subroutine mexfunction(nlhs,plhs,nrhs,prhs) This is how the gateway will access the input (RHS) and output (LHS) arguments to the MEX function call. The basic outline is 1. ) about input arguments and check their validity.

5); f(mask) = 1 + cos(2*pi*x(mask)); | x| ≤ 12 | x| > 12 . 6 OPTIMIZING PERFORMANCE 42 The mask is a logical index into x (see page 12). You could refer, if needed, to the unmasked points by using ˜mask. Consider a new version of the sum-of-primes idea from page 27: sum( find( isprime(1:100) ) ) Here find converts a logical index into an absolute one. The only disadvantage of doing so in general is that referring to the unmasked elements becomes more difficult. 5 Exercises 1. Rewrite trap or simp (page 29) so that it does not use any loops.

2 Preallocate memory MATLAB hides the tedious process of allocating memory for variables. This generosity can cause you to waste a lot of runtime, though. 3 seconds on a certain computer. Almost all of this time, though, is spent on a noncomputational task. When MATLAB encounters the statement y = ones(100,1), it asks the operating system for a block of memory to hold 100 numbers. On the first execution of the loop, it becomes clear that we actually need space to hold 200 numbers, so a new block of this size is requested.

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Crash course in Matlab by Driscoll


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