Matrix transposition: Difference between revisions

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@@ Line 621: / Line 621: @@
 =={{header|D}}==
-<lang d>import std.stdio, std.string, std.algorithm, std.array;
+<lang d>import std.stdio, std.algorithm, std.array, std.conv;
-auto transpose(T)(T[][] m) {
+pure nothrow auto transpose(T)(in T[][] m) {
     auto r = new T[][](m[0].length, m.length);
     foreach (nr, row; m)
@@ Line 629: / Line 629: @@
             r[nc][nr] = c;
     return r;
-}
-auto prettyPrint(T)(T[][] m) {
-    return "[" ~ array(map!format(m)).join("\n ") ~ "]";
 }
 void main() {
-    auto M = [[10,11,12,13], [14,15,16,17], [18,19,20,21]];
+    auto M = [[10, 11, 12, 13],
+              [14, 15, 16, 17],
-    writeln("M:\n", M.prettyPrint());
+              [18, 19, 20, 21]];
-    writeln("\nM transposed:\n", M.transpose().prettyPrint());
+    auto Mt = transpose(M);
+    writeln("[", array(map!text(Mt)).join("\n "), "]");
 }</lang>
 Output:
-<pre>M:
+<pre>[[10, 14, 18]
-[[10,11,12,13]
+ [11, 15, 19]
- [14,15,16,17]
+ [12, 16, 20]
- [18,19,20,21]]
+ [13, 17, 21]]</pre>
-M transposed:
-[[10,14,18]
- [11,15,19]
- [12,16,20]
- [13,17,21]]</pre>
 =={{header|ELLA}}==