while compiling my code I get the following message:

matfunoperable.cpp: In member function ?virtual void
matfunoperable::qrdelete(gsl_matrix*, gsl_matrix*, size_t, char)?:
matfunoperable.cpp:32: warning: suggest parentheses around assignment
used as truth value
matfunoperable.cpp:35: warning: suggest parentheses around assignment
used as truth value



Code snippet that contains lines 32 and 35:

32 for (size_t iter = 0; iter = j-2; iter++){
33
gsl_vector_memcpy(&gsl_matrix_column(R_new,iter).v ector,&gsl_matrix_column(R,iter).vector);
34 }
35 for (size_t iter = j-1; iter = n-1; iter++){
36
gsl_vector_memcpy(&gsl_matrix_column(R_new,iter).v ector,&gsl_matrix_column(R,(iter+1)).vector);
37 }


prototype of the function (in the .h file) in which the above snippet
is contained is:

virtual void qrdelete(gsl_matrix *Q_new, gsl_matrix *R_new, const
size_t j, const char orient);


The executable is formed. However when I run the executable, none of
the instructions in main() are executed. Can anyone throw some light on
what is happening here?

Thanks,
A

A wrote:[color=blue]
> while compiling my code I get the following message:
>
> matfunoperable.cpp: In member function ?virtual void
> matfunoperable::qrdelete(gsl_matrix*, gsl_matrix*, size_t, char)?:
> matfunoperable.cpp:32: warning: suggest parentheses around assignment
> used as truth value
> matfunoperable.cpp:35: warning: suggest parentheses around assignment
> used as truth value
>
>
>
> Code snippet that contains lines 32 and 35:
>
> 32 for (size_t iter = 0; iter = j-2; iter++){[/color]

Common bug which your compiler is kind enough to point out - you are
using assignment (=) rather than equality (==).


--
Ian Collins.

A wrote:[color=blue]
> while compiling my code I get the following message:
>
> matfunoperable.cpp: In member function ?virtual void
> matfunoperable::qrdelete(gsl_matrix*, gsl_matrix*, size_t, char)?:
> matfunoperable.cpp:32: warning: suggest parentheses around assignment
> used as truth value
> matfunoperable.cpp:35: warning: suggest parentheses around assignment
> used as truth value
>
>
>
> Code snippet that contains lines 32 and 35:
>
> 32 for (size_t iter = 0; iter = j-2; iter++){[/color]
[color=blue]
> The executable is formed. However when I run the executable, none of
> the instructions in main() are executed. Can anyone throw some light on
> what is happening here?[/color]

You're compiler is giving you a pretty good idea. Is it really your
intention to assign the value of j - 2 to iter and then test to make
sure the result is not 0?

What occurs is actually the best that could happen...other option is
infinite loop.

Ian Collins wrote:[color=blue]
> A wrote:
>[color=green]
>>while compiling my code I get the following message:
>>
>>matfunoperable.cpp: In member function ?virtual void
>>matfunoperable::qrdelete(gsl_matrix*, gsl_matrix*, size_t, char)?:
>>matfunoperable.cpp:32: warning: suggest parentheses around assignment
>>used as truth value
>>matfunoperable.cpp:35: warning: suggest parentheses around assignment
>>used as truth value
>>
>>
>>
>>Code snippet that contains lines 32 and 35:
>>
>>32 for (size_t iter = 0; iter = j-2; iter++){[/color]
>
>
> Common bug which your compiler is kind enough to point out - you are
> using assignment (=) rather than equality (==).
>[/color]
Or whatever comparison operator you intended.

--
Ian Collins.

Thank you all. This was so unexpected.
A