我想做一个＆＃34;噪音＆＃34;图片。如果我做
img = np.random.randint(0, 255, (4, 4), dtype=np.uint8)
print(img)
出：
array([[150, 45, 246, 137],
[195, 141, 246, 197],
[206, 126, 188, 76],
[134, 168, 166, 190]])
每个像素都不同。但是，如果我想要更大的像素，例如：
，该怎么办？array([[150, 150, 246, 246],
[150, 150, 246, 246],
[206, 206, 188, 188],
[206, 206, 188, 188]])
我该怎么办？
答案 0 :(得分：2)
您可以使用ObservableList<Bot> bots = FXCollections.observableArrayList();
@FXML
private TableView<Bot> botTable;
@FXML
private TableColumn<Bot, String> nameColumn;
@FXML
private TableColumn<Bot, Boolean> statusColumn;
public void initialize(URL location, ResourceBundle resources){
nameColumn.setCellValueFactory(new PropertyValueFactory<Bot, String>("name"));
statusColumn.setCellValueFactory(new PropertyValueFactory<Bot, Boolean>("on"));
statusColumn.setSortable(false);
statusColumn.setCellValueFactory(new Callback<TableColumn.CellDataFeatures<Bot, Boolean>, ObservableValue<Boolean>>(){
@Override public ObservableValue<Boolean> call(TableColumn.CellDataFeatures<Bot, Boolean> features) {
return new SimpleBooleanProperty(features.getValue() != null);
}
});
// create a cell value factory with an add button for each row in the table.
statusColumn.setCellFactory(new Callback<TableColumn<Bot, Boolean>, TableCell<Bot, Boolean>>() {
@Override public TableCell<Bot, Boolean> call(TableColumn<Bot, Boolean> personBooleanTableColumn) {
return new AddBotCell(/*stage, botTable*/);
}
});
botTable.setItems(bots);
}
/** A table cell containing a button for adding a new person. */
private class AddBotCell extends TableCell<Bot, Boolean> {
// a checkbox for adding a new bot.
final CheckBox checkbox = new CheckBox();
// pads and centers the add button in the cell.
final StackPane paddedCheckBox = new StackPane();
AddBotCell(/*final Stage stage, final TableView table*/) {
paddedCheckBox.setPadding(new Insets(3));
paddedCheckBox.getChildren().add(checkbox);
checkbox.setOnMouseClicked(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
}
});
}
/** places an add checkbox in the row only if the row is not empty. */
@Override protected void updateItem(Boolean item, boolean empty) {
super.updateItem(item, empty);
if (!empty) {
setContentDisplay(ContentDisplay.GRAPHIC_ONLY);
setGraphic(checkbox);
}
}
}
：
np.kron或>>> np.kron(np.random.randint(0, 256, (4, 4)), np.ones((2, 2), int))
array([[252, 252, 51, 51, 10, 10, 124, 124],
[252, 252, 51, 51, 10, 10, 124, 124],
[161, 161, 137, 137, 8, 8, 89, 89],
[161, 161, 137, 137, 8, 8, 89, 89],
[ 12, 12, 24, 24, 37, 37, 98, 98],
[ 12, 12, 24, 24, 37, 37, 98, 98],
[151, 151, 149, 149, 147, 147, 15, 15],
[151, 151, 149, 149, 147, 147, 15, 15]])
（每个维度一次）：
np.repeat