⍕ — Format⍕Y returns character text. Matrix rows remain rows.
⍕1 2 3 ⍝ '1 2 3'
D⍕Y gives D decimal places. Negative D selects exponent notation.
2⍕3.125 ⍝ ' 3.13'
W D⍕Y supplies field width too; pairs can be supplied per column. Width 0 chooses a width. Overflowing fields become *.
6 2⍕3.125 ⍝ ' 3.13'
Formatting is independent of REPL boxing.