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Go, go, go! ! ! ! ! ! Matlab mathematics experiment
Clear, clc

s _ BM( 1)= 100; Hairless percentage

s _ Cao( 1)= 0; % grassland

s _ GM( 1)= 0; % shrub

s _ HW( 1)= 0; Percentage of poverty

s _ GM(2)= 0; s _ HW(2)= 0;

S _ Cao(2)= S _ Cao( 1)+0.3 * S _ BM( 1);

S _ BM(2)= S _ BM( 1)-S _ Cao(2)-S _ GM(2)-S _ HW(2);

Because i=3:500

S _ GM(I)= S _ GM(I- 1)+0. 1 * S _ Cao(I- 1)-0.04 * S _ GM(I- 1);

S _ Cao(I)= S _ Cao(I- 1)+0.3 * S _ BM(I- 1)-0. 1 * S _ Cao(I- 1)-0.05 * S _ Cao(I- 1)+0.04 * S _ GM(I- 1);

S _ HW(I)= S _ HW(I- 1)+0.05 * S _ Cao(I- 1);

S _ BM(I)= 100-S _ GM(I)-S _ Cao(I)-S _ HW(I);

end

t = 1: 1:500;

plot(t,S_bm,' *r ',t,S_cao,' og ',t,S_gm,'。 b ',t,S_hw,' & gtc’)