Revision as of 20:13, 26 November 2014

⍴ — Shape or Reshape — Keystroke ALT+r — Character 9076

Note: This is ALT+r; ALT+SHIFT+R will generate the symbol root (√).

Z←L⍴R

returns an array of shape L whose items are taken from R in row major order, repeated as necessary.

L is a scalar or vector of non-negative integers, and R is an arbitrary array.

If the right argument is empty, the result consists of ×/⍴L copies of the fill item of R.

For example, in origin-1

2 3⍴⍳6
1 2 3
4 5 6
2 3⍴⍳0
0 0 0
0 0 0

The idea for the latter enhancement was taken from Dyalog APL.

The symbol ⍴ used with no left argument returns the size or dimensions of a scalar, string, vector, array or matrix.

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@@ Line 4: / Line 4: @@
 [[File:APLKB-Rho.png]]
-==Usage==
+==Reshape==
-==Example==
+<table border="1" cellpadding="5" cellspacing="0" rules="none" summary="">
+<tr>
+  <td>
+    <table border="0" cellpadding="5" cellspacing="0" summary="">
+    <tr>
+      <td valign="top"><apll>Z←L⍴R</apll></td>
+      <td></td>
+      <td></td>
+      <td>returns an array of shape <apll>L</apll> whose items are taken from <apll>R</apll> in row major order, repeated as necessary.</td>
+    </tr>
+    </table>
+  </td>
+</tr>
+<tr>
+  <td><apll>L</apll> is a scalar or vector of non-negative integers, and <apll>R</apll> is an arbitrary array.</td>
+</tr>
+<tr>
+  <td>If the right argument is empty, the result consists of <apll>×/⍴L</apll> copies of the fill item of <apll>R</apll>.
+</tr>
+</table>
+<br />
+<p>For example, in origin-1</p>
+<apll>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2 3⍴⍳6<br />
+&nbsp;1 2 3<br />
+&nbsp;4 5 6<br />
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2 3⍴⍳0<br />
+&nbsp;0 0 0<br />
+&nbsp;0 0 0<br /></apll>
+<p>The idea for the latter enhancement was taken from Dyalog APL.</p>
+==Shape==
+The symbol {rho} used with no left argument returns the size or dimensions of a scalar, string, vector, array or matrix.
+{{article footer}
+[[Category:Monadic Operators]]
+[[Category:Dyadic Operators]]
 ==See Also==