https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/unexpected-mkl-interval-addition-result/m-p/951344#M15241 <DIV>Yes, this is a bug. Thank you for pointing it out.</DIV> <DIV></DIV> <DIV>We are currently working on this, and, hopefully,the stuation will be fixed in MKL 8.1. </DIV> Tue, 31 Jan 2006 18:12:12 GMT Intel_C_Intel 2006-01-31T18:12:12Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/unexpected-mkl-interval-addition-result/m-p/951343#M15240 Hello,<BR /><BR />The attached simple program "ti.f90" gives<BR /><BR />1 =[1.00000000000000000,1.00000000000000000] 0.00E+00 -&gt; GOOD<BR />3 =[3.00000000000000000,3.00000000000000000] 0.00E+00 -&gt; GOOD<BR />1/3 =[0.33333333333333331,0.33333333333333337] 0.56E-16 -&gt; GOOD<BR />4/3 =[1.33333333333333326,1.33333333333333348] 0.22E-15 -&gt; GOOD<BR />1+1/3=[1.33333333333333348,1.33333333333333348] 0.00E+00 -&gt; BAD !<BR /><BR />The compilation was done using<BR /><BR />ifort -D_LINUX $R/include/mkl_interval.f90 ti.f90 <BR /> -L$R/lib/32 -lmkl_lapack -lmkl_ia32<BR /><BR />Is it a mkl/8.0.1/lib/32/libmkl_lapack.a library bug or<BR />I'm wrong (I have not find any detailed documentation)<BR />Thanks<BR />Best regards<BR /><BR />-- <BR />Fabrice Thu, 12 Jan 2006 22:35:52 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/unexpected-mkl-interval-addition-result/m-p/951343#M15240 fabriceapardo 2006-01-12T22:35:52Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/unexpected-mkl-interval-addition-result/m-p/951344#M15241 <DIV>Yes, this is a bug. Thank you for pointing it out.</DIV> <DIV></DIV> <DIV>We are currently working on this, and, hopefully,the stuation will be fixed in MKL 8.1. </DIV> Tue, 31 Jan 2006 18:12:12 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/unexpected-mkl-interval-addition-result/m-p/951344#M15241 Intel_C_Intel 2006-01-31T18:12:12Z