robin

i have an interface built wth lcd on which i want to display float values which i've rounded to 2 decimal places - ie, 0.777000 becomes 0.780000, but i don't want the extra zeros - i only want to display 0.78. anyone any idea on how i do this?

i have an interface built wth lcd on which i want to display float values which i've rounded to 2 decimal places - ie, 0.777000 becomes 0.780000, but i don't want the extra zeros - i only want to  display 0.78. anyone any idea on how i do this?

query-re-displaying-floats

Quote: robin wrote on Fri, 28 September 2007 10:44

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> i have an interface built wth lcd on which i want to display float values which i've rounded to 2 decimal places - ie, 0.777000 becomes 0.780000, but i don't want the extra zeros - i only want to display 0.78. anyone any idea on how i do this?

Make sure that you keep the output of the sprintf as a symbol. Max will try to convert it to a float, if possible, and you'll loose your formatting.

Quote: robin wrote on Fri, 28 September 2007 10:44
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> hi
>
> i have an interface built wth lcd on which i want to display float values which i've rounded to 2 decimal places - ie, 0.777000 becomes 0.780000, but i don't want the extra zeros - i only want to  display 0.78. anyone any idea on how i do this?
>
> thanks
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Make sure that you keep the output of the sprintf as a symbol.  Max will try to convert it to a float, if possible, and you'll loose your formatting.

brilliant...i'd just turned to sprintf, but hadn't got so far as that.

uh...actually, that doesn't appear to work. it still gives 4 decimal places - if i feed it 0.12 i get 0.1200 out, even as a symbol

Quote: robin wrote on Fri, 28 September 2007 11:13

> uh...actually, that doesn't appear to work. it still gives 4 decimal places - if i feed it 0.12 i get 0.1200 out, even as a symbol

Max is aggressive about converting... looks like LCD is changing it back to a float. If you add a blank character at the end it should work.

Quote: robin wrote on Fri, 28 September 2007 11:13
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> uh...actually, that doesn't appear to work. it still gives 4 decimal places - if i feed it 0.12 i get 0.1200 out, even as a symbol
----------------------------------------------------

Max is aggressive about converting... looks like LCD is changing it back to a float.  If you add a blank character at the end it should work.

> Quote: robin wrote on Fri, 28 September 2007 11:13

> ----------------------------------------------------

>> uh...actually, that doesn't appear to work. it still gives 4 

>> decimal places - if i feed it 0.12 i get 0.1200 out, even as a symbol

> Max is aggressive about converting... looks like LCD is changing it 

> back to a float. If you add a blank character at the end it should 

It's because you need to output a symbol from sprintf, and then 

>
> Quote: robin wrote on Fri, 28 September 2007 11:13
> ----------------------------------------------------
>> uh...actually, that doesn't appear to work. it still gives 4  
>> decimal places - if i feed it 0.12 i get 0.1200 out, even as a symbol
> ----------------------------------------------------
>
> Max is aggressive about converting... looks like LCD is changing it  
> back to a float.  If you add a blank character at the end it should  
> work.

It's because you need to output a symbol from sprintf, and then  
prepend by "write".

query re. displaying floats