"Mike Lim" <yoong.lim.nospam@eng.monash.edu.au> wrote in
message <fmcf4r$re6$1@fred.mathworks.com>...
> Hi Folks,
>
> I am struck with an error message with Matlab for
> sometime.
>
> >> whos data_daq2
> Name Size Bytes Class
>
> data_daq2 500x2 8000 double
> array
>
> Grand total is 1000 elements using 8000 bytes
>
> >> data_daq2
>
> data_daq2 =
>
> -0.3683 -0.3171
> -1.1497 -1.0985
> 0.4131 0.4644
> -0.3683 1.2458
> -0.3683 -1.0985
> 0.4131 1.2458
> 0.4131 0.4644
> 1.1946 -0.3171
>
> .... blaq blaq ..... alot more data, I truncated the rest.
>
> The problem is I cannot do a diff (I am trying to do a
> numerical approximate differentiation.
>
>
> >> diff(data_daq2(:,1))
> ??? Subscript indices must either be real positive integers
> or logicals.
>
> The weird thing is I have managed to do the same
> diff(data_daq2(:,1)) in a earlier version of code.
>
> I am pretty sure and I know that initial vector position is
> 1. So this is not the syntax error I am running into.
>
> Please advise.
>
> Thank you.
>
>
It maybe that you have a variable named 'diff' or your own
file use the same name as the built-in function diff.m.
"Anh Huy Phan" <phananhhuy@mathworks.com> wrote in message
<fmcgnm$8ml$1@fred.mathworks.com>...
> "Mike Lim" <yoong.lim.nospam@eng.monash.edu.au> wrote in
> message <fmcf4r$re6$1@fred.mathworks.com>...
> > Hi Folks,
> >
> > I am struck with an error message with Matlab for
> > sometime.
> >
> > >> whos data_daq2
> > Name Size Bytes Class
> >
> > data_daq2 500x2 8000 double
> > array
> >
> > Grand total is 1000 elements using 8000 bytes
> >
> > >> data_daq2
> >
> > data_daq2 =
> >
> > -0.3683 -0.3171
> > -1.1497 -1.0985
> > 0.4131 0.4644
> > -0.3683 1.2458
> > -0.3683 -1.0985
> > 0.4131 1.2458
> > 0.4131 0.4644
> > 1.1946 -0.3171
> >
> > .... blaq blaq ..... alot more data, I truncated the
rest.
> >
> > The problem is I cannot do a diff (I am trying to do a
> > numerical approximate differentiation.
> >
> >
> > >> diff(data_daq2(:,1))
> > ??? Subscript indices must either be real positive
integers
> > or logicals.
> >
> > The weird thing is I have managed to do the same
> > diff(data_daq2(:,1)) in a earlier version of code.
> >
> > I am pretty sure and I know that initial vector
position is
> > 1. So this is not the syntax error I am running into.
> >
> > Please advise.
> >
> > Thank you.
> >
> >
>
>
> It maybe that you have a variable named 'diff' or your
own
> file use the same name as the built-in function diff.m.
>
> For checking, type in the command line
> open diff
>
> or
> whos diff
>
> Anh Huy Phan
> RIKEN - BSI
Is there any way for me to prevent such things from
happening?
As in, I will have a warning message from Matlab if I redo
something silly in the future?
Any command / options?
Thank you.
"Anh Huy Phan" <phananhhuy@mathworks.com> wrote in message
<fmcgnm$8ml$1@fred.mathworks.com>...
> "Mike Lim" <yoong.lim.nospam@eng.monash.edu.au> wrote in
> message <fmcf4r$re6$1@fred.mathworks.com>...
> > Hi Folks,
> >
> > I am struck with an error message with Matlab for
> > sometime.
> >
> > >> whos data_daq2
> > Name Size Bytes Class
> >
> > data_daq2 500x2 8000 double
> > array
> >
> > Grand total is 1000 elements using 8000 bytes
> >
> > >> data_daq2
> >
> > data_daq2 =
> >
> > -0.3683 -0.3171
> > -1.1497 -1.0985
> > 0.4131 0.4644
> > -0.3683 1.2458
> > -0.3683 -1.0985
> > 0.4131 1.2458
> > 0.4131 0.4644
> > 1.1946 -0.3171
> >
> > .... blaq blaq ..... alot more data, I truncated the
rest.
> >
> > The problem is I cannot do a diff (I am trying to do a
> > numerical approximate differentiation.
> >
> >
> > >> diff(data_daq2(:,1))
> > ??? Subscript indices must either be real positive
integers
> > or logicals.
> >
> > The weird thing is I have managed to do the same
> > diff(data_daq2(:,1)) in a earlier version of code.
> >
> > I am pretty sure and I know that initial vector
position is
> > 1. So this is not the syntax error I am running into.
> >
> > Please advise.
> >
> > Thank you.
> >
> >
>
>
> It maybe that you have a variable named 'diff' or your
own
> file use the same name as the built-in function diff.m.
>
> For checking, type in the command line
> open diff
>
> or
> whos diff
>
> Anh Huy Phan
> RIKEN - BSI
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