How to get hours from hh:mm

How to get hours from hh:mm

[Cecil Westerhof]

I have a table in org-mode with time needed to travel from A to B an the
number of km. I would like to get the average speed. How do I convert a
time? For example 0:45 becomes 0.75.

Re: How to get hours from hh:mm

[Pascal Bourguignon]

Cecil Westerhof <dummy@dummy.nl> writes:

> I have a table in org-mode with time needed to travel from A to B an the
> number of km. I would like to get the average speed. How do I convert a
> time? For example 0:45 becomes 0.75.

How do you know that 0:45 becomes 0.75?

How did you do it?


-- 
__Pascal Bourguignon__                     http://www.informatimago.com/

NOTE: The most fundamental particles in this product are held
together by a "gluing" force about which little is currently known
and whose adhesive power can therefore not be permanently
guaranteed.

Re: How to get hours from hh:mm

[Cecil Westerhof]

Pascal Bourguignon wrote:

> Cecil Westerhof <dummy@dummy.nl> writes:
> 
>> I have a table in org-mode with time needed to travel from A to B an the
>> number of km. I would like to get the average speed. How do I convert a
>> time? For example 0:45 becomes 0.75.
> 
> How do you know that 0:45 becomes 0.75?
> 
> How did you do it?

I did not. I want. 0:45 is three quarters of an hour, so in mathematical
notation 0.75.
What I would like:
- the first field contains 90
- the second field contains 0:45, or 00:45
- the third field is computed to 120

Re: How to get hours from hh:mm

[Pascal Bourguignon]

Cecil Westerhof <dummy@dummy.nl> writes:

> Pascal Bourguignon wrote:
>
>> Cecil Westerhof <dummy@dummy.nl> writes:
>> 
>>> I have a table in org-mode with time needed to travel from A to B an the
>>> number of km. I would like to get the average speed. How do I convert a
>>> time? For example 0:45 becomes 0.75.
>> 
>> How do you know that 0:45 becomes 0.75?
>> 
>> How did you do it?
>
> I did not. I want. 0:45 is three quarters of an hour, so in mathematical
> notation 0.75.

How do you know that 0:45 is THREE QUARTERS of an hour?
What if it was 0:38 ?  How would you compute it in "mathematical notation"?


-- 
__Pascal Bourguignon__                     http://www.informatimago.com/

NOTE: The most fundamental particles in this product are held
together by a "gluing" force about which little is currently known
and whose adhesive power can therefore not be permanently
guaranteed.

Re: How to get hours from hh:mm

[Alexis Roda]

En/na Pascal Bourguignon ha escrit:
> Cecil Westerhof <dummy@dummy.nl> writes:
> 
>> Pascal Bourguignon wrote:
>>
>>> Cecil Westerhof <dummy@dummy.nl> writes:
>>>
>>>> I have a table in org-mode with time needed to travel from A to B an the
>>>> number of km. I would like to get the average speed. How do I convert a
>>>> time? For example 0:45 becomes 0.75.
>>> How do you know that 0:45 becomes 0.75?
>>>
>>> How did you do it?
>> I did not. I want. 0:45 is three quarters of an hour, so in mathematical
>> notation 0.75.

Something like this could be helpful:

(defun time100(time)
   (let ((timelist (split-string time ":")))
     (+ (string-to-number (car timelist))
        (/ (string-to-number (cadr timelist))
           60.0))))


HTH

Re: How to get hours from hh:mm

[J. David Boyd]

Cecil Westerhof <dummy@dummy.nl> writes:

> Pascal Bourguignon wrote:
>
>> Cecil Westerhof <dummy@dummy.nl> writes:
>> 
>>> I have a table in org-mode with time needed to travel from A to B an the
>>> number of km. I would like to get the average speed. How do I convert a
>>> time? For example 0:45 becomes 0.75.
>> 
>> How do you know that 0:45 becomes 0.75?
>> 
>> How did you do it?
>
> I did not. I want. 0:45 is three quarters of an hour, so in mathematical
> notation 0.75.
> What I would like:
> - the first field contains 90
> - the second field contains 0:45, or 00:45
> - the third field is computed to 120

It is based on dividing by 60.

0:45 is 45 minutes, which is 45/60 of an hour.

This becomes .75.

Re: How to get hours from hh:mm

[Pascal Bourguignon]

david@adboyd.com (J. David Boyd) writes:

> Cecil Westerhof <dummy@dummy.nl> writes:
>
>> Pascal Bourguignon wrote:
>>
>>> Cecil Westerhof <dummy@dummy.nl> writes:
>>> 
>>>> I have a table in org-mode with time needed to travel from A to B an the
>>>> number of km. I would like to get the average speed. How do I convert a
>>>> time? For example 0:45 becomes 0.75.
>>> 
>>> How do you know that 0:45 becomes 0.75?
>>> 
>>> How did you do it?
>>
>> I did not. I want. 0:45 is three quarters of an hour, so in mathematical
>> notation 0.75.
>> What I would like:
>> - the first field contains 90
>> - the second field contains 0:45, or 00:45
>> - the third field is computed to 120
>
> It is based on dividing by 60.
>
> 0:45 is 45 minutes, which is 45/60 of an hour.
>
> This becomes .75.

You need to unlock Cecil's neurons!  He clearly knows it, but he
doesn't know that he knows it.


-- 
__Pascal Bourguignon__                     http://www.informatimago.com/

NOTE: The most fundamental particles in this product are held
together by a "gluing" force about which little is currently known
and whose adhesive power can therefore not be permanently
guaranteed.

Re: How to get hours from hh:mm

[cmr.Pent]

"Unlock Cecil's neurons"
Mana cost 60, cooldown time 30

Removes all negative effects from target and gives it +2 intelligence
for 3 sec. The target should have at least 1 neuron. Can only be cast
on Cecil.

;-)

Re: How to get hours from hh:mm

[Cecil Westerhof]

Alexis Roda wrote:
> Something like this could be helpful:
> 
> (defun time100(time)
>    (let ((timelist (split-string time ":")))
>      (+ (string-to-number (car timelist))
>         (/ (string-to-number (cadr timelist))
>            60.0))))

I tried this:

(defun getMinutes(time)
  (interactive "sDuration: ")
  (let ((timelist (split-string time ":")))
    (+ 
      (string-to-number (car timelist))
      (/ 
        (string-to-number (cadr timelist))
        60.0
      )
    )
  )
)

When I dan give M-x getMinutes and on the prompt give: 00:18, I get:
        Symbol's function definition is void: let

Re: How to get hours from hh:mm

[Cecil Westerhof]

Cecil Westerhof wrote:
> I tried this:
> 
> (defun getMinutes(time)

Wrong name, should be getHours. But not important for the problem.

Re: How to get hours from hh:mm

[Joost Kremers]

Cecil Westerhof wrote:
[...]
>   (let ((timelist (split-string time ":")))
[...]
>
> When I dan give M-x getMinutes and on the prompt give: 00:18, I get:
>         Symbol's function definition is void: let

most likely because there's a hard space after let. at least there is when
i reply to your message.


-- 
Joost Kremers                                      joostkremers@yahoo.com
Selbst in die Unterwelt dringt durch Spalten Licht
EN:SiS(9)

Re: How to get hours from hh:mm

[David Kastrup]

Cecil Westerhof <dummy@dummy.nl> writes:

> Alexis Roda wrote:
>> Something like this could be helpful:
>> 
>> (defun time100(time)
>>    (let ((timelist (split-string time ":")))
>>      (+ (string-to-number (car timelist))
>>         (/ (string-to-number (cadr timelist))
>>            60.0))))
>
> I tried this:
>
> (defun getMinutes(time)
>   (interactive "sDuration: ")
>   (let ((timelist (split-string time ":")))
>     (+ 
>       (string-to-number (car timelist))
>       (/ 
>         (string-to-number (cadr timelist))
>         60.0
>       )
>     )
>   )
> )
>
> When I dan give M-x getMinutes and on the prompt give: 00:18, I get:
>         Symbol's function definition is void: let

Never cut&paste code from articles with KNode.  It randomly peppers
material with non-breakable spaces.

Get a real newsreader, like Gnus.

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum

Re: How to get hours from hh:mm

[Stephen Berman]

On Sat, 16 Jun 2007 17:10:48 +0200 Cecil Westerhof <dummy@dummy.nl> wrote:

> Alexis Roda wrote:
>> Something like this could be helpful:
>> 
>> (defun time100(time)
>>    (let ((timelist (split-string time ":")))
>>      (+ (string-to-number (car timelist))
>>         (/ (string-to-number (cadr timelist))
>>            60.0))))
>
> I tried this:
>
> (defun getMinutes(time)
>   (interactive "sDuration: ")
>   (let ((timelist (split-string time ":")))
>     (+ 
>       (string-to-number (car timelist))
>       (/ 
>         (string-to-number (cadr timelist))
>         60.0
>       )
>     )
>   )
> )
>
> When I dan give M-x getMinutes and on the prompt give: 00:18, I get:
>         Symbol's function definition is void: let

Somehow your version contains nobreak space characters starting right
after `let'.  If you change all of those to normal space characters,
the function works fine.

Steve Berman

Re: How to get hours from hh:mm

[Cecil Westerhof]

David Kastrup wrote:
> Never cut&paste code from articles with KNode.  It randomly peppers
> material with non-breakable spaces.

Not nice. :-{
That was the problem. And it was also at another place.

Maybe I should upgrade to Emacs 22.


> Get a real newsreader, like Gnus.

Is on my todo list.