这个问题在这里已经有了答案:Isfloatingpointmathbroken?(31个回答)关闭7年前。我需要在Java中做一些浮点运算,如下代码所示:publicclassTestMain{privatestaticMapccc=newHashMap(){{put(1,0.01);put(2,0.02);put(3,0.05);put(4,0.1);put(6,0.2);put(10,0.5);put(20,1.0);put(30,2.0);put(50,5.0);put(100,10.0);}};Doubleincrement(Doublei,booleanup){Doublei
其中,TP表示正类数预测为正类数的个数;FP为负类数预测为正类数的个数;FN为正类数预测为负类数的个数;TN为负类数预测为负类数的个数。附上python代码:#coding=utf-8importmatplotlib.pyplotaspltimportnumpyasnpconfusion=np.array(([190,0,0,0,0,0,0,0,0,0,10,0,0,0,0],[0,200,0,0,0,0,0,0,0,0,0,0,0,0,0],[0,0,200,0,0,0,0,0,0,0,0,0,0,0,0],[0,0,0,199,0,0,0,1,0,0,0,0,0,0,0],[0
我正在尝试使用php中的preg_replace函数来精确匹配字符串。我只想匹配具有单个“@”符号的实例。我还需要一个变量作为模式传入。$x="@hello,@@hello,@hello,@@hello"$temp='@hello'$x=preg_replace("/".$temp."/","replaced",$x);结果应该是:$x="replaced,@@hello,replaced,@@hello"提前谢谢你。 最佳答案 添加负数look-behind(?如果$temp匹配失败前面是@(或者,简单来说,如果@之前有一个@he