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函数 PI() 功能返回PI常数

vpa(pi,300) vpa(pi)

>> A(1,1) = {[1 4 3; 0 5 8; 7 2 9]}; >> A(1,2) = {'Anne Smith'}; >> A(2,1) = {3+7i}; >> A(2,2) = {-pi:pi/4:pi}

>> 0.5*pi*5^2 >> 0.5*pi*5^2*10

>> s= 0.5*pi*5^2 >> v=s*10

function y = foo(x) y = 2*pi*x;

function y = test y = [ 1 0; 0 1] * [ pi pi/2; -pi -pi/2 ];

function g1=g1(r) g1=1.0344*pi*r.^2;

function g2=g2(r) g2=2.797866667*pi*r.^4;

>> A(1,1) = {[1 4 3; 0 5 8; 7 2 9]}; >> A(1,2) = {'Anne Smith'}; >> A(2,1) = {3+7i}; >> A(2,2) = {-pi:pi/4:pi}