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Access violation writing an array after using MATMUL

 
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qt



Joined: 23 Aug 2005
Posts: 46
Location: Berlin, Germany
PostPosted: Mon Oct 30, 2006 9:01 am    Post subject: Access violation writing an array after using MATMUL Reply with quote
Hi Paul,

Professor Lassmann reported another bug I have proofed with v4.91 of FTN95. He wrote:

The demonstration program Test_matmul leads to an unexpected error message “Access violation” caused by the statements

tmp = MatMul (b,u)
Write (*,*) 'tmp = ', tmp

The following statement gives the right answer

Write (*,*) 'tmp = ', tmp (1:2)


He supplied a demo program that shows the error:




Winapp

Program Test_matmul

Implicit None

Real , Dimension (1:2,1:2) :: u
Real , Dimension (1:2 ) :: b, tmp

u = +0.

u (1,1) = -1.
u (2,2) = -1.

b = +0.
b (1 ) = +1.

tmp = +2.

Write (*,*) 'u = ', u
Write (*,*) 'b = ', b
Write (*,*) 'tmp = ', tmp

tmp = MatMul (b,u)

! The following statement gives the right answer

! Write (*,*) 'tmp = ', tmp (1:2)

! The following statement gives 'Access Violation'

Write (*,*) 'tmp = ', tmp

End Program Test_matmul





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PaulLaidler
Site Admin


Joined: 21 Feb 2005
Posts: 7927
Location: Salford, UK
PostPosted: Mon Nov 06, 2006 2:09 pm    Post subject: Access violation writing an array after using MATMUL Reply with quote
Joerg

I have logged this as a compiler bug that needs fixing.

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PaulLaidler
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Joined: 21 Feb 2005
Posts: 7927
Location: Salford, UK
PostPosted: Thu Nov 16, 2006 5:54 am    Post subject: Access violation writing an array after using MATMUL Reply with quote
Joerg

This bug has now been fixed for the next release.

Regards

Paul
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KL
Guest
PostPosted: Mon Dec 18, 2006 10:20 am    Post subject: Problem “Access violation writing an array after using MATMU Reply with quote
I have rerun this problem with FTN95 v5.0 and the problem has been solved. Thank you very much!

Klaus Lassmann
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