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<body class='hmmessage'><div dir='ltr'><div>Dear Sir or Madam</div><div><br></div>I am a new PETSc user. I am using PETSc library with fortran. <div>I have the following problem. I want to use the matrix-free form of krylov solvers. So I am starting by using the example ex14f.F.</div><div><span style="font-size: 12pt;">In this example, within subroutine mymult() I try call another subroutine which calculates the vector I need as the result of the matrix-vector multiplication.In this second subroutine the vector is defined as a simple array. (Is this the problem?) </span></div><div><span style="font-size: 12pt;">The problem is that I receive errors when I'm attempting to run the program. The problem seems to be related with memory, but I am not sure.</span></div><div><span style="font-size: 12pt;"><br></span></div><div><span style="font-size: 12pt;">The first line of errors can be seen below:</span></div><div><span style="font-size: 12pt;">"</span><span style="font-size: 12pt;">Caught signal number 11 SEGV: Segmentation Violation, probably memory access out of range"</span></div><div><span style="font-size: 12pt;"><br></span></div><div><span style="font-size: 12pt;"><br></span></div><div><span style="font-size: 12pt;">Could you help me?</span></div><div><span style="font-size: 12pt;"><br></span></div><div><span style="font-size: 12pt;">Thanks in advance</span></div> </div></body>
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