>> graphics_toolkit('qt') >> theta = 0:0.01:2*pi; >> rho = (sin(3*theta)).^2; >> polar(theta,rho); __plt__>__plt2__ at line 246 column 14 __plt__ at line 113 column 17 polar>__plr2__ at line 217 column 14 polar at line 83 column 14 error: octave_base_value::convert_to_str_internal (): wrong type argument '' error: called from __line__ at line 117 column 21 line at line 56 column 8 __plt__>__plt2vv__ at line 500 column 10 __plt__>__plt2__ at line 246 column 14 __plt__ at line 113 column 17 polar>__plr2__ at line 217 column 14 polar at line 83 column 14 error: octave_base_value::convert_to_str_internal (): wrong type argument '' error: called from __line__ at line 117 column 21 line at line 56 column 8 __plt__>__plt2vv__ at line 500 column 10 __plt__>__plt2__ at line 246 column 14 __plt__ at line 113 column 17 polar>__plr2__ at line 217 column 14 polar at line 83 column 14 error: octave_base_value::convert_to_str_internal (): wrong type argument '' error: called from __line__ at line 117 column 21 line at line 56 column 8 __plt__>__plt2vv__ at line 500 column 10 __plt__>__plt2__ at line 246 column 14 __plt__ at line 113 column 17 polar>__plr2__ at line 217 column 14 polar at line 83 column 14 error: octave_base_value::convert_to_str_internal (): wrong type argument '' error: called from __line__ at line 117 column 21 line at line 56 column 8 __plt__>__plt2vv__ at line 500 column 10 __plt__>__plt2__ at line 246 column 14 __plt__ at line 113 column 17 polar>__plr2__ at line 217 column 14 polar at line 83 column 14 error: octave_base_value::convert_to_str_internal (): wrong type argument '' error: called from __line__ at line 117 column 21 line at line 56 column 8 __plt__>__plt2vv__ at line 500 column 10 __plt__>__plt2__ at line 246 column 14 __plt__ at line 113 column 17 polar>__plr2__ at line 217 column 14 polar at line 83 column 14 error: octave_base_value::convert_to_str_internal (): wrong type argument '' error: called from __line__ at line 117 column 21 line at line 56 column 8 __plt__>__plt2vv__ at line 500 column 10 __plt__>__plt2__ at line 246 column 14 __plt__ at line 113 column 17 polar>__plr2__ at line 217 column 14 polar at line 83 column 14 >> panic: Segmentation fault -- stopping myself... attempting to save variables to 'octave-workspace'... save to 'octave-workspace' complete Segmentation fault (core dumped) [godfrey@pbdsl4 linux]$