python - slicing column in numpy array and creating new matrix -


i have concatenate columns of numpy matrix create new matrix. have 2 codes. 1 working fine. other giving me trouble. 1 working fine is

x = np.array(range(24)) x = x.reshape((3,4,2)) y = np.array(range(100,124)) y = y.reshape((3,4,2)) z = np.concatenate((x,y))

now result 6,4,2 if axis =0 si 3,8,2 if axis=1 , 3,4,4 if axis=2. @ code:

a=np.array(([1,2,3],[4,5,6],[7,8,9]) b=a[:,1] # took 1 column c=a[:,0] # again took 1 column d=np.concatenate((b,c))

if provide axis=0 result 1x6. if provide axis=1 again 1,6. want in 1 case 1,6 in 3,2. ie

[2,1],[5,4],[8,7]

and in 2,3 ie

[2,5,8],[1,4,7]

i wondering why concatenate not working me?

use vstack

>>> import numpy np >>> a=np.array(([1,2,3],[4,5,6],[7,8,9])) >>> b=a[:,1] # took 1 column >>> c=a[:,0] # again took 1 column >>> np.vstack((b,c)) array([[2, 5, 8],        [1, 4, 7]])

use np.transpose if necessary


Comments

Post a Comment

Popular posts from this blog

javascript - Using jquery append to add option values into a select element not working -

i'm looking dynamically populate select element names of items stored array. for reason it's not working , i'm not sure why. html: <div class="col-md-4 col-md-offset-4"> <select class="select1"> </select> , <select class="select2"> </select> </div> note i'm using bootstrap layout. here's jquery i'm using try , populate ".select1" jquery: select: function() { $.each(state.greens, function(index, value) { $(".select1").append("<option value =' " + index + " '>" + state.greens[index].name + "</option>"); }); } note function 'select' stored within object called 'display'. state.greens name of array i'm trying access. so @ end of html page call display.select(); call function. no error messages showing in console. also, saw question: appending
Read more

Android soft keyboard reverts to default keyboard on orientation change -

i'm building android soft keyboard , can't seem fix bug - have arabic , qwerty keyboard , when rotate device on qwerty keyboard (or arabic shift), it's if program has "restarted" , becomes arabic keyboard without shift. the onsaveinstancestate(bundle savedinstancestate) not work because application not extend activity inputmethodservice . i put following in android manifest android:configchanges="keyboard|keyboardhidden|orientation" android:windowsoftinputmode="stateunchanged|adjustresize"> i tried using @override public void onconfigurationchanged(configuration newconfig) { super.onconfigurationchanged(newconfig); log.i(mydebug, "config changed " + currentkeyboard.equals(qwerty)); } however, currentkeyboard.equals(qwerty)) results false , made sure true before orientation change. any appreciated. i think applications fault. if application restarting on orientation change
Read more

Rendering JButton to get the JCheckBox behavior in a JTable by using images does not update my table -

i rendering jbutton image on simulate jcheckbox behavior. why don't let jtable render jcheckbox? because need bigger checkboxes , there's no way can resize them (as far know). so, have own table cell renderer , editor. both renders jbutton , checkbox images on them. trying change image checked image unchecked image (or vice versa) , update cell value (boolean true or false). however, reason, getcelleditorvalue() not update table. so, release mouse, value goes original one. any appreciated! lot! public class tableexample extends jframe { jscrollpane pane; jpanel panel; jtable table; object[][] data; mytablemodel tm; renderer buttoncolumn; public tableexample(object[][] data) throws ioexception { string[] columns = {"column#1", "column#2", "column#3", "column#4", "column#5", "column#6"}; this.data = data; this.setpreferredsize(new dimension(700, 500));
Read more