急!matlab,如何判断一个函数在是不是大于0的?程序如下,不知道哪里错了,不能显示第二个图形 for t=0:20; if sin(t)>0 y=1; else y=-1; endendsubplot(2,1,1)t=0:0.1:20;plot(t,sin(t))axis([0 20 -1.5 1.5])su
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![急!matlab,如何判断一个函数在是不是大于0的?程序如下,不知道哪里错了,不能显示第二个图形 for t=0:20; if sin(t)>0 y=1; else y=-1; endendsubplot(2,1,1)t=0:0.1:20;plot(t,sin(t))axis([0 20 -1.5 1.5])su](/uploads/image/z/10981996-52-6.jpg?t=%E6%80%A5%21matlab%2C%E5%A6%82%E4%BD%95%E5%88%A4%E6%96%AD%E4%B8%80%E4%B8%AA%E5%87%BD%E6%95%B0%E5%9C%A8%E6%98%AF%E4%B8%8D%E6%98%AF%E5%A4%A7%E4%BA%8E0%E7%9A%84%3F%E7%A8%8B%E5%BA%8F%E5%A6%82%E4%B8%8B%2C%E4%B8%8D%E7%9F%A5%E9%81%93%E5%93%AA%E9%87%8C%E9%94%99%E4%BA%86%2C%E4%B8%8D%E8%83%BD%E6%98%BE%E7%A4%BA%E7%AC%AC%E4%BA%8C%E4%B8%AA%E5%9B%BE%E5%BD%A2+for+t%3D0%3A20%3B++++if+sin%28t%29%3E0+++++++y%3D1%3B++++else+++++++y%3D-1%3B++++endendsubplot%282%2C1%2C1%29t%3D0%3A0.1%3A20%3Bplot%28t%2Csin%28t%29%29axis%28%5B0+20+-1.5+1.5%5D%29su)
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