Keeping only one digit after the dot.

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SUMMARY

The discussion centers on the mathematical methods for truncating a decimal number to retain only one digit after the decimal point. The proposed solution involves using the floor function, specifically the formula floor(10 * x) / 10, to achieve the desired result of converting 10.292288 to 10.2. Participants clarify that this method is distinct from rounding, which can yield different results depending on the direction of rounding. The conversation also touches on the concept of significant digits, indicating that truncation and rounding are not interchangeable processes.

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PrudensOptimus
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Hello,


Is there a mathematical way to get rid of all the digits after the dot except one? 10.292288.. how do i just make it 10.2?
 
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floor(10x)/10, perhaps?

See this for information on the floor function if it is unfamiliar.
 
U mean rounding...?BTW,oif u mean rounding,then your example could go both ways:rounding a decimal more which would mean 10.3,or less,which would mean 10.2

If u mean "significative digits",then the whole mechanism is not that simple as rounding decimals.In your case,u gave a # with 8 sign.digits and u want it with 3 only.In this case,the answer is correct.

Daniel.
 

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