matlab-unifrnd函数

unifrnd Random arrays from continuous uniform distribution.
    R = unifrnd(A,B) returns an array of random numbers chosen from the
    continuous uniform distribution on the interval from A to B.  The size
    of R is the common size of A and B if both are arrays.  If either
    parameter is a scalar, the size of R is the size of the other
    parameter.

    R = unifrnd(A,B,M,N,...) or R = unifrnd(A,B,[M,N,...]) returns an
    M-by-N-by-... array.

clc,clear;
x = unifrnd(0,12,[1,10000000]);%在[0,12]区间模拟1行10的7次方的数组
y = unifrnd(0,9, [1,10000000]);%在[0,9]区间模拟1行10的7次方的数组

frequency = sum(y<x.^2&x<=3)+sum(y<12-x&x>=3);
area_appr = 9*12*(frequency/10^7);

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