Math?

[mjoekingz28]

Is 32.9 32 or 33? It may seem better to say 33 as it is ONLY one tenth, but it IS still 32!

Like in racing, well I am knocking on the door of 11s, but am running consistent 12.1Xs......you may be close to 11s but you are most certainly still in twelves. Do we just round up or down when it suits an agenda, or get lazy?


A 32 is a 32 whether it be 32.01 or 32.9999999.

 

[SHOZ]

When looking at a fractional number the last digit is usually rounded up or down.

On my Hyundais they OE logic sets temperature readout in 1*C for everything but the oil temp which is 1.25*C.

So if the temp is displayed in 1*C increments, when the actual temp is say 99.4C it displays 99C. When the temp is 99.6C the temp displayed is 100C. x.5C is the make or break point. Anything equal or above gets rounded up, anything less is rounded down.

 

[BRZED]

Originally Posted By: SHOZ
So if the temp is displayed in 1*C increments, when the actual temp is say 99.4C it displays 99C. When the temp is 99.6C the temp displayed is 100C. x.5C is the make or break point. Anything equal or above gets rounded up, anything less is rounded down.


The display could be made to flash if the temperature is at the mid-point. A flashing 67°C would denote 66.5°C.

 

[SHOZ]

What sucks with the 1*C readings is the loss in resolution when compared to Fahrenheit. It's ~1.8*F per 1*C.

 

[Garak]

Originally Posted By: BRZED
The display could be made to flash if the temperature is at the mid-point. A flashing 67°C would denote 66.5°C.

Or, 66.5 should be rounded down to 66 and 67.5 up to 68, as is the convention.

 

[Garak]

Originally Posted By: SHOZ
What sucks with the 1*C readings is the loss in resolution when compared to Fahrenheit. It's ~1.8*F per 1*C.

Maybe. What really sucks is the quality of workmanship and the error bar. Go pick up a handful of identical thermometers at your local hardware store. Look at the ridiculous spread in readings, be they digital or analog.

When two thermometers side by side have a reading difference of 4 C, that is getting a bit large.

 

[BRZED]

Originally Posted By: Garak
Originally Posted By: BRZED
The display could be made to flash if the temperature is at the mid-point. A flashing 67°C would denote 66.5°C.

Or, 66.5 should be rounded down to 66 and 67.5 up to 68, as is the convention.


The real question is why anybody would use a thermormeter with less than 1/10 degree resolution.

 

[Garak]

Well, on car displays, I can understand it. The G37 uses 1 degree resolution for outside temperature, but a 0.5 degree resolution for setting climate control.

 

[BRZED]

Originally Posted By: Garak
Well, on car displays, I can understand it. The G37 uses 1 degree resolution for outside temperature, but a 0.5 degree resolution for setting climate control.


Or on the outside of a buyilding. Who cares about a 1°C difference in ambient temperature? If 20° makes you sweat and 19° makes you have chills, you need to see doctor, or at least post a medical question on an oil forum..

 

[Garak]

Well, it can be important in setting a climate control or a house thermostat. I get a little picky about the heat, and 19 could be a little cold in the house.

 

[BRZED]

Originally Posted By: Garak
Well, it can be important in setting a climate control or a house thermostat. I get a little picky about the heat, and 19 could be a little cold in the house.

Why don't you tailor yourself a nice garment to finetune your comfort level?

 

[ZeeOSix]

Originally Posted By: Garak
Or, 66.5 should be rounded down to 66 and 67.5 up to 68, as is the convention.


Not quite grasping your example.

The convention (using 1 decimal place numbers as an example) for rounding to the whole number is anything between 66.1 to 66.4 would be rounded down to 66 and anything between 66.5 to 66.9 would be rounded up to 67.

 

[BRZED]

Which way does the taxman round?

 

[Garak]

Originally Posted By: ZeeOSix
Not quite grasping your example.

The way it's done in physics and chemistry is as follows:

66.5 has an even number ahead to the left of the 5, so, accordingly, the 6 is kept as a 6. 67.5 has on odd number to the left of the 5, so, the 7 is rounded up to 68. Otherwise, you have five different possible numbers being rounded up and only four being rounded down.

Originally Posted By: BRZED
Why don't you tailor yourself a nice garment to finetune your comfort level?

I'd rather tailor the climate of this province.

 

[ZeeOSix]

Originally Posted By: BRZED
Which way does the taxman round?


Right from the 1040 Instructions:

Rounding Off to Whole Dollars
You can round off cents to whole dollars
on your return and schedules. If you do
round to whole dollars, you must round
all amounts. To round, drop amounts under
50 cents and increase amounts from 50 to 99 cents to the next dollar.

For example,$1.39 becomes $1 and $2.50 becomes $3.
If you have to add two or more
amounts to figure the amount to enter on
a line, include cents when adding the
amounts and round off only the total.

 

[Shannow]

Originally Posted By: BRZED
Originally Posted By: Garak
Originally Posted By: BRZED
The display could be made to flash if the temperature is at the mid-point. A flashing 67°C would denote 66.5°C.

Or, 66.5 should be rounded down to 66 and 67.5 up to 68, as is the convention.


The real question is why anybody would use a thermormeter with less than 1/10 degree resolution.


Given the old adage that Ignorance is bliss...there are a lot of people who like to remain blissful

 

[SHOZ]

Originally Posted By: ZeeOSix
Originally Posted By: Garak
Or, 66.5 should be rounded down to 66 and 67.5 up to 68, as is the convention.


Not quite grasping your example.

The convention (using 1 decimal place numbers as an example) for rounding to the whole number is anything between 66.1 to 66.4 would be rounded down to 66 and anything between 66.5 to 66.9 would be rounded up to 67.



Yes this is how it's done when a computer determines it, or logic.

The real pain with Hyundai is using C in the 1* increments.

 

[Garak]

As in all .5 increments are rounded up, or by the way I mentioned? Practically, it isn't a big deal, but it does eliminate bias when dealing with a lot of numbers. I just looked, and didn't realize the rule I quoted had a name. It's called "Round Half to Even," among other things. The professors said just do it. The Wikipedia article on it says that it's the default rounding mode used in IEEE 754 functions and operators.