How do I randomly select k points from N points in MATLAB? -

-

I use this code to create and filter the N points: 

  n = input ('number of nodes:'); Data = rand (n, 2)% randomly generated n Nodes x = data (:, 1); Y = data (:, 2); Plot (x, y, '*'); How can I choose the  k  point (with probability  p = 0.25 ) outside of the  n  points, then those  k  Paint the dots and leave the other points as  * .

You can take two methods that you can do the first solution randomly k Choosing N values ​​from values, will ensure that you have selected always near k . The second solution is to take the values ​​randomly, with the average probability p to be selected, which can be as low as 0 or as many as Sorting as N is being selected randomly.

You can use the function to create a random permutation of N via code> 1 , then select the first code sorted list and copy them as red : 

  index = randosperm (n); Plot (x (index (1: k)), y (index (1: t)), 'r *');

  • Choosing values ​​with the average probability p :

    you use You can do this to get a random value from 0 to 1 for each of your N values, then select those people whom Copy to a random value or your average probability p and copy it as red: 

      index = (rand (n, 1)

    • Comments

    Post a Comment

    Popular posts from this blog

    c# - How to capture HTTP packet with SharpPcap -

    -
    I would like to capture all incoming HTTP packets on my machine. To do this, I am using SharpPcap which is a WinPcap The cover is. SharpPcap works very well, but it captures TCP packets and what it wants to do for me is a very low level. Does anyone know how can I easily get full HTTP requests / reactions from all these TCP packets? Thanks SharpPcap is already able to capture the packet in the same way That's what the virus does (just in the code instead of the GUI). And you can either either parse them directly or you can put them in the drive in the common .pcap file format. The steps to parse the capture are: Open a connection at any time Loop a while Or start capturing using an event callback Parsing the raw packet for the type you want If you are reading .PPP dump files In addition to calling you an offline capture reader is almost the same, there is no need to select an interface, and you can set the majority There is no need to do the modes. All st...
    Read more

    php - Multiple Select with Explode: only returns the word "Array" -

    -
    By using Wordpress I have created a multiple selection box so that users can select categories to exclude. When the page is initially loaded, I see my predefined default option. However, when I select a new value and I save ... I only see the word "Array" and have not chosen anything else? & lt; Class = "amultiple" id = "& lt; php echo $ value ['id'] ;? gt;" name = "& gt; php echo $ value ['id'] ;; gt; []" Multiple = "multiple" size = "8" & gt; & Lt ;? Php global option; Foreign currency ($ value as value $) {if (get_settings ($ value ['id']) === FALSE {$$ value ['id'] = $ value ['std']; } And {$$ value ['id'] = get_settings ($ value ['id']); }} $ Ranges = & amp; Amp; Categories ('type = post & orderbiz = name & amp; hide_empty = 1'); If ($ ranges) {$ ex_cat = implode (',', $ tt_cat_exclude); Forex Currency ($ range a...
    Read more

    jquery - SimpleModal Confirm fails to submit form -

    -
    I am trying to confirm jQuery to show yes / no confirmation when I submit a form. I had modified (in the last list) to capture and block form submissions. However, it only works with jQuery 1.2.6, a recent upgrade stops 1.3.2, if yes is clicked, then by submitting the form. But I can not understand what is wrong / inconsistent in my code now. Demo (which works in both versions of a simple window.href implementation). $ (document) .ready (function () {$ ('input.delete'). Click (function (e) {e.preventDefault (); var target = $ (e .target); Confirm ("Really delete this event?", Function () {target.click ()});});}); How about something like this? The idea of ​​catching clicks (and fire!) On the submitted event is not click event. $ (document) .ready (function () {$ ('# myForm'). Submit (function () {var f = this; Confirm (" Remove? ", Function () {$ (f). Submit ();}) Return; Return the initial session;}}}}; Hope That this is som...
    Read more