clear

问题 I have a program that reads in a really large Excel file and creates some large variables. This runs out of storage if I try to run it multiple times in a row, which makes sense, i.e.: large_program; large_program will crash. However, what I don't understand is why large_program; clear all; large_program will also crash; in order to run it multiple times, I have to restart MATLAB each time. Does MATLAB not actually clear all variables? Or is this a fragmentation of memory thing? 回答1: Matlab

问题 I want to click on the preference is cleared the cache of my app. I did this, but it does not work and there are errors. How can I fix? This is the whole source. Many Thanks!!!!!! public class Impo extends PreferenceActivity{ Preference info; Intent intent; Preference cache; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.addPreferencesFromResource(R.xml.layout); info= (Preference) this.findPreference(

问题 I'm developing an app with Swift 3.0 and working with the Google Maps SDK. I arrived at the point that by clicking on the map I draw a polygon where at each vertex I add a marker. Like the image given below: What I want to do is when I move a marker. With the "didDrag" event, repaint the new polygon with the new markers' positions. But this happens: The code is: //Path Line and Polygon var pathLine = GMSMutablePath() //Create Line of Poligon var linePolygon = GMSPolyline() //All markers and

问题 I use the following command: isosurface(data,color) Now if I use the same command with different data again , it gets superimposed on the previous one. So, I tried doing: p = patch(isosurface(foo)); isonormals(foo,p) delete(p); to delete the previous plot, but this way i can't use the colorbar . How do I go about this? 回答1: Have you tried this? cla(gca) cla clears an axes and gca is the handle to the current axes you're are plotting on. 回答2: Assuming you just want another patch plot in the

问题 I came across one programming issue that I have tried to solve it as follows: dsDataSet.Tables("promotion") = New DataTable. But Unfortunately this does not work because error: property 'Item' is read only Is there away to accomplish this? 回答1: The Tables collection of a DataSet could be modified using the Add, Remove methods dsDataSet.Tables.Add(new DataTable("promotion")) of course, the line above requires that the collection doesnt already contain a table named "promotion". If you have

问题 Hey I'm trying to make a clear button for my polish calculator.. code give me this error when executing the clear button unrecognized selector sent to instance 0x6a6e1e0' there is a button in the interface builder linked to clearBtn this code is in the CalculatorViewController.m display is linked to the UILabel and.. heres the code - (IBAction)clearBtn { if (self.userIsInTheMiddleOfEnteringANumber) { [[self display] setText:@"0"]; [self setUserIsInTheMiddleOfEnteringANumber:NO]; } } -

问题 I am having a problem with my website. I have some animations when a redirect is happening to get a transition effect from page to page. The problem is that if a user clicks the Browsers Back button it goes to the previous page but it does not reset the animations so everything stays hidden as when you exited the page. To have a demo of the error go to http://www.econtentsys.gr/affiliate/xenosk/temp/amigdalos/main.php , Click on About Me and then click on your browsers (history) Back button.

问题 I have some columns in listview which are "Column1", "Column2",.... I want to clear (set null character at that cells) and remove some cells from related columns which can be (1.column) "Column1".Could you help me? Specific question: After selected rows deleted, I want to update my ID column with updated numbers with a button. How can I do that? for (int i = 1; i <= newID; i++) { int newID = listView1.Items.Count; listView1.Items[0].Remove(listView1.Columns[0].ListView.Items.Count); //

问题 I am making a calculator in python using tkinter. The calculator works very well apart from one thing. At the moment I have set the calculator to clear the display. I want to make it so that it clears the last number on the display. For example 564 would become 56. Any help greatly appreciated. #Import tkinter from Tkinter import * #Setup quit button def quit(): window.destroy() #What happens when you click the button def buttonclick(event): global calcvalue global savedvalue global operator

问题 Actually there are some similar questions about this topic but I couldn't see the answer what I am looking for. For example I have drawn 2 lines on windows form and I want to delete one of them and keep the other , how can I do that? this.Invalidate(); or Graphics.Clear(); clear all the form, I don't want this, I want to delete specific line . Do you have any other solutions? 回答1: The following will delete the all created lines in reverse chronological sequence. Graphics g; Pen p; Bitmap bmp;