我有 leftBox.setPrefSize(200, 250);
rightBox.setPrefSize(200, 250);
leftBox.setStyle("-fx-background-color:blue");
Button btn1 = new Button("First");
Button btn2 = new Button("Second");
Button btn3 = new Button("Third");
ColorPicker colorpicker = new ColorPicker();
leftBox.getChildren().addAll(btn1,btn2,btn3);
rightBox.getChildren().add(colorpicker);
colorpicker.setOnAction(e->{
if(btn2.isFocused()){
btn2.setText("color changed.");
}
});
HBox root = new HBox();
root.getChildren().addAll(leftBox,rightBox);
Scene scene = new Scene(root, 400, 250);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
矩阵，例如113*401矩阵。我想创建一个随机矩阵100次，所以我将有一个X矩阵。重要的是该值是从我的主矩阵11300*401随机获取的。
答案 0 :(得分：1)
此代码从整个输入矩阵B中选择结果矩阵X的元素。因此，B的列不是X列的排列。
X = rand(113,401); % sample matrix
% generate random indices and use them to pull values from A
B = X(randi([1 numel(X)],11300,401));