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<span style="margin:0px;font-size:12pt;color:black;background-color:rgb(255, 255, 255)">Dear Sir/Madam,</span></div>
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<span style="margin:0px;font-size:12pt;color:black;background-color:rgb(255, 255, 255)"> My name is Guangpu Zhu, I met a problem when I tested the matrix operation in petsc4py. <span style="margin:0px">As the following code shows, I first set all elements
of the matrix to 2.0. Then, I try to set the diagonal elements of the matrix to 1.0. However, I surprisingly found that the diagonal elements are still 2.0. This question has confused me for a few days, so I am writing to you for help or suggestions. Attached
is the test code I used. I would greatly appreciate it if you can kindly reply to me. Thank you in ad</span></span><br>
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<span style="font-size:12pt; font-family:Cambria,Georgia,serif">Guangpu Zhu</span></div>
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<span style="font-size:12pt; font-family:Cambria,Georgia,serif">Research Associate, Department of Mechanical Engineering</span></div>
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<span style="color:rgb(0,0,0); font-family:Cambria,Georgia,serif; font-size:12pt">National University of Singapore</span></div>
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<span style="font-size:12pt; font-family:Cambria,Georgia,serif">Personal E-mail: zhugpupc@gmail.com</span></div>
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