https://community.intel.com/t5/Intel-Fortran-Compiler/Cannot-set-a-complex-8-s-imaginary-component-to-ieee-signaling/m-p/1747543#M178844 <P class=""><STRONG><SPAN class="">Compiler</SPAN></STRONG><SPAN class="">: ifx (IFX) 2026.0.0</SPAN></P><P class=""><STRONG><SPAN class="">OS</SPAN></STRONG><SPAN class="">: Ubuntu 22.04.05 LTS (Jammy Jellyfish)</SPAN></P><P class="">&nbsp;</P><P class=""><SPAN class="">The imaginary part of a complex(8) number cannot successfully be set to ieee_signaling_nan. When displayed, it correct shows "NaN", but when compared using ieee_class to ieee_signaling_nan, it comes up false.&nbsp;</SPAN><SPAN class="">Please see the following example; it is also attached.</SPAN></P><LI-CODE lang="markup">program main use, intrinsic :: ieee_arithmetic implicit none complex(8) :: c8 c8 = cmplx(0d0, ieee_value(c8%im,ieee_signaling_nan)) print *, c8 print *, c8%im print *, ieee_class(c8%im) == ieee_signaling_nan print *, ieee_class(imag(c8)) == ieee_signaling_nan end program</LI-CODE><P>&nbsp;</P><P>Note that the real part of the complex(8) can be set to ieee_signaling_nan, and the complex(4) case works for real, imaginary, and both.</P> Mon, 11 May 2026 16:05:38 GMT WileyOne 2026-05-11T16:05:38Z https://community.intel.com/t5/Intel-Fortran-Compiler/Cannot-set-a-complex-8-s-imaginary-component-to-ieee-signaling/m-p/1747543#M178844 <P class=""><STRONG><SPAN class="">Compiler</SPAN></STRONG><SPAN class="">: ifx (IFX) 2026.0.0</SPAN></P><P class=""><STRONG><SPAN class="">OS</SPAN></STRONG><SPAN class="">: Ubuntu 22.04.05 LTS (Jammy Jellyfish)</SPAN></P><P class="">&nbsp;</P><P class=""><SPAN class="">The imaginary part of a complex(8) number cannot successfully be set to ieee_signaling_nan. When displayed, it correct shows "NaN", but when compared using ieee_class to ieee_signaling_nan, it comes up false.&nbsp;</SPAN><SPAN class="">Please see the following example; it is also attached.</SPAN></P><LI-CODE lang="markup">program main use, intrinsic :: ieee_arithmetic implicit none complex(8) :: c8 c8 = cmplx(0d0, ieee_value(c8%im,ieee_signaling_nan)) print *, c8 print *, c8%im print *, ieee_class(c8%im) == ieee_signaling_nan print *, ieee_class(imag(c8)) == ieee_signaling_nan end program</LI-CODE><P>&nbsp;</P><P>Note that the real part of the complex(8) can be set to ieee_signaling_nan, and the complex(4) case works for real, imaginary, and both.</P> Mon, 11 May 2026 16:05:38 GMT https://community.intel.com/t5/Intel-Fortran-Compiler/Cannot-set-a-complex-8-s-imaginary-component-to-ieee-signaling/m-p/1747543#M178844 WileyOne 2026-05-11T16:05:38Z