Thread Subject: Help using "disp"

Hello

I have done a calcualtion and I get this

ans=

11.3

But I want it to say

The answer is: 11.3

How do I do that with the disp function?

Thanks

"Daniel Eliasson" <danielel@kth.se> wrote in message <glc2bi$3ee$1@fred.mathworks.com>...
> Hello
>
> I have done a calcualtion and I get this
>
> ans=
>
> 11.3
>
> But I want it to say
>
> The answer is: 11.3
>
> How do I do that with the disp function?
>
> Thanks

I come from a C background so I always do this


ans = 11.3;
fprintf('The answer is: %3.1f\n', ans);

"P" <pyjunk.nospam@shaw.ca> wrote in message <glc2ms$pgd$1@fred.mathworks.com>...
> "Daniel Eliasson" <danielel@kth.se> wrote in message <glc2bi$3ee$1@fred.mathworks.com>...
> > Hello
> >
> > I have done a calcualtion and I get this
> >
> > ans=
> >
> > 11.3
> >
> > But I want it to say
> >
> > The answer is: 11.3
> >
> > How do I do that with the disp function?
> >
> > Thanks
>
> I come from a C background so I always do this
>
>
> ans = 11.3;
> fprintf('The answer is: %3.1f\n', ans);


Thanks, but sometimes it gives "The answer is: 0.0" even if its not 0
my example:

I write this
UtBrd=Bredning*InBrd
fprintf('Wu width: %3.1f\n', UtBrd);

and this happens
UtBrd=
0.0309

Wu Width: 0.0

Is there something with the decimals?

On 23 Jan., 11:09, "Daniel Eliasson" <danie...@kth.se> wrote:
> "P" <pyjunk.nos...@shaw.ca> wrote in message <glc2ms$pg...@fred.mathworks.com>...
> > "Daniel Eliasson" <danie...@kth.se> wrote in message <glc2bi$3e...@fred.mathworks.com>...
> > > Hello
>
> > > I have done a calcualtion and I get this
>
> > > ans=
>
> > > 11.3
>
> > > But I want it to say
>
> > > The answer is: 11.3
>
> > > How do I do that with the disp function?
>
> > > Thanks
>
> > I come from a C background so I always do this
>
> > ans = 11.3;
> > fprintf('The answer is: %3.1f\n', ans);
>
> Thanks, but sometimes it gives "The answer is: 0.0" even if its not 0
> my example:
>
> I write this
> UtBrd=Bredning*InBrd
> fprintf('Wu width: %3.1f\n', UtBrd);
>
> and this happens
> UtBrd=
> 0.0309
>
> Wu Width: 0.0
>
> Is there something with the decimals?

perhaps you should look in matlab help what the fprintf parameters
do...

Hi again,

fprintf is very powerful but it does sometime to get use to syntax.

The magic format string '%3.1f' means 3 things

1. 3 is Field Width, 'A digit string specifying the minimum number of digits to be printed'
2. 1 is Precision, 'A digit string including a period (.) specifying the number of digits to be printed to the right of the decimal point'
3. f implies fixed-point notation.

So yes you need to change the 1 to get to the other decimal. The %x.y formatting allows you to line up strings very nicely.

a=101
b=0.00001
fprintf('THIS IS %10.5f\n',a)
fprintf('THIS IS %10.5f\n',b)

"P" <pyjunk.nospam@shaw.ca> wrote in message <glc6b1$fr7$1@fred.mathworks.com>...
> Hi again,
>
> fprintf is very powerful but it does sometime to get use to syntax.
>
> The magic format string '%3.1f' means 3 things
>
> 1. 3 is Field Width, 'A digit string specifying the minimum number of digits to be printed'
> 2. 1 is Precision, 'A digit string including a period (.) specifying the number of digits to be printed to the right of the decimal point'
> 3. f implies fixed-point notation.
>
> So yes you need to change the 1 to get to the other decimal. The %x.y formatting allows you to line up strings very nicely.
>
> a=101
> b=0.00001
> fprintf('THIS IS %10.5f\n',a)
> fprintf('THIS IS %10.5f\n',b)


Thank you very much!

fprintf is a pain. For generic formatting, use:

disp(['The answer is: ' num2str(ans)])

- Tom



"Daniel Eliasson" <danielel@kth.se> wrote in message <glc6ke$4gn$1@fred.mathworks.com>...
> "P" <pyjunk.nospam@shaw.ca> wrote in message <glc6b1$fr7$1@fred.mathworks.com>...
> > Hi again,
> >
> > fprintf is very powerful but it does sometime to get use to syntax.
> >
> > The magic format string '%3.1f' means 3 things
> >
> > 1. 3 is Field Width, 'A digit string specifying the minimum number of digits to be printed'
> > 2. 1 is Precision, 'A digit string including a period (.) specifying the number of digits to be printed to the right of the decimal point'
> > 3. f implies fixed-point notation.
> >
> > So yes you need to change the 1 to get to the other decimal. The %x.y formatting allows you to line up strings very nicely.
> >
> > a=101
> > b=0.00001
> > fprintf('THIS IS %10.5f\n',a)
> > fprintf('THIS IS %10.5f\n',b)
>
>
> Thank you very much!
>

On Jan 23, 6:49=A0am, "Thomas Clark" <t.cl...@remove.spamcantab.net>
wrote:
> fprintf is a pain. For generic formatting, use:
>
> disp(['The answer is: ' num2str(ans)])
>
> - Tom
>
> "Daniel Eliasson" <danie...@kth.se> wrote in message <glc6ke$4g...@fred.m=
athworks.com>...
> > "P" <pyjunk.nos...@shaw.ca> wrote in message <glc6b1$fr...@fred.mathwor=
ks.com>...
> > > Hi again,
>
> > > fprintf is very powerful but it does sometime to get use to syntax.
>
> > > The magic format string '%3.1f' means 3 things
>
> > > 1. 3 is Field Width, 'A digit string specifying the minimum number of=
 digits to be printed'
> > > 2. 1 is Precision, 'A digit string including a period (.) specifying =
the number of digits to be printed to the right of the decimal point'
> > > 3. f implies fixed-point notation.
>
> > > So yes you need to change the 1 to get to the other decimal. The %x.y=
 formatting allows you to line up strings very nicely.
>
> > > a=3D101
> > > b=3D0.00001
> > > fprintf('THIS IS %10.5f\n',a)
> > > fprintf('THIS IS %10.5f\n',b)
>
> > Thank you very much!

How would you format -- disp(['The answer is: ' num2str(ans)]) -- to
output a predetermined number of decimal places? I think fprintf is
great; but I also spend a lot of time in C.

In article <glc6ke$4gn$1@fred.mathworks.com>,
 "Daniel Eliasson" <danielel@kth.se> wrote:

> "P" <pyjunk.nospam@shaw.ca> wrote in message
> <glc6b1$fr7$1@fred.mathworks.com>...
> > Hi again,
> >
> > fprintf is very powerful but it does sometime to get use to syntax.
> >
> > The magic format string '%3.1f' means 3 things
> >
> > 1. 3 is Field Width, 'A digit string specifying the minimum number of
> > digits to be printed'
> > 2. 1 is Precision, 'A digit string including a period (.) specifying the
> > number of digits to be printed to the right of the decimal point'
> > 3. f implies fixed-point notation.
> >
> > So yes you need to change the 1 to get to the other decimal. The %x.y
> > formatting allows you to line up strings very nicely.
> >
> > a=101
> > b=0.00001
> > fprintf('THIS IS %10.5f\n',a)
> > fprintf('THIS IS %10.5f\n',b)
>
>
> Thank you very much!

You might be happier with %g:

fprintf('The answer is %g.\n',x)

--
Doug Schwarz
dmschwarz&ieee,org
Make obvious changes to get real email address.