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  • \$\begingroup\$ @WeeingIfFirst Oh, of course, thank you very much! \$\endgroup\$ Commented Sep 18, 2016 at 14:22
  • \$\begingroup\$ 6 bytes shorter: z([1,b],1:a)=45;z(1:b,[1,a])=124;z=[z,''] \$\endgroup\$ Commented Sep 18, 2016 at 14:31
  • \$\begingroup\$ Even shorter: z(b,a)=' ';z([1,b],:)=45;z(:,[1,a])=124 \$\endgroup\$ Commented Sep 18, 2016 at 14:54
  • \$\begingroup\$ @LuisMendo Thanks! We still need the string tough, otherwise the array is converted to a numerical one. \$\endgroup\$ Commented Sep 18, 2016 at 14:55
  • \$\begingroup\$ @flawr z(b,a)=' ' initiallizes as char. After that you can fill with numbers and they are automatically cast to char. z maintains its original type \$\endgroup\$ Commented Sep 18, 2016 at 14:56