begwind是什么意思？

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begwind;
makewind(9,6.855,0,0,0);
makewind(9/3,6.855/3,3.0,1.7,1);
/* create data */
x = seqa(.01,.04,250);
y = abs(sin(x)^2 .* cos(x)^2 ./ (sin(x)+1));
title("LOGY Graph w/Polar Inset\labs(sin(x)[2] * cos(x)[2] / (sin(x)+.8))");
xlabel("Sequence of X");
ylabel("Logarithmic Y Scale");
_plwidth = { 0 1 2 4 };
_pltype = 6;
_pcolor = { 11, 3, 9, 1 };
_plegctl = { 1 4 };
_plegstr = "f(x)\0f(x)*.4\0f(x)*.1\0f(x)*.02";
logy(x,y~y*.4~y*.1~y*.02);
nextwind;
_plwidth = 2;
xlabel("");
ylabel("");
_plegctl = 0;
title("Polar Representation");
_ptitlht = .25;
polar(x,y);
endwind;
在以上程序中，begwind、makewind和nextwind命令是什么意思？

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关键词：是什么意思 wind beg IND Win GAUSS

bigwind
purpose: initialize global graphic panel variables;
library: pgraph;
format: begwind;
remarks: this procdure must be called before any other graphic panel functions are called;
Source:ｐｗｉｎｄｏｗ．ｓｒｃ

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图形控制命令