2014/10/15 下午 10:07:27

iphone Programming Glossary: doubles

http://stackoverflow.com/questions/10049533/correcting-floating-point-numbers

g seems to round everything quite appropriately. ex. answer.text NSString stringWithFormat@ g doubleAnswer Using doubles through your calculations and then using that method seemed to work for me and I hope this helps others as well. If this..

Improving Finger Painting Performance

http://stackoverflow.com/questions/1355527/improving-finger-painting-performance

Sorting an array of doubles or CLLocationDistance values on the iPhone

http://stackoverflow.com/questions/1422840/sorting-an-array-of-doubles-or-cllocationdistance-values-on-the-iphone

an array of doubles or CLLocationDistance values on the iPhone I'm trying to sort a list of CLLocationDistance values by closest distance ascending..

Strange problem comparing floats in objective-C

http://stackoverflow.com/questions/1614533/strange-problem-comparing-floats-in-objective-c

a modifier are considered to be double in C. However in C there is no exact representation of 0.1 in floats and doubles. Now using a float gives you a small error. Using a double gives you an even smaller error. The problem now is that by casting..

which dataType will return the value (37.961498) as it is ? Double dint work

http://stackoverflow.com/questions/19656315/which-datatype-will-return-the-value-37-961498-as-it-is-double-dint-work

Cumulative Normal Distribution function in objective C

http://stackoverflow.com/questions/2785944/cumulative-normal-distribution-function-in-objective-c

and variance it will be return 0.5 erfc mean x sqrt variance M_SQRT1_2 If you don't need double precision change the doubles to floats use the erfcf function and change the literals to single precision literals. Remember Objective C is an extremely..

How to store CLLocation using Core Data (iPhone)?

http://stackoverflow.com/questions/3797128/how-to-store-cllocation-using-core-data-iphone

cllocation share improve this question What you're doing is fine. You should save the latitude and longitude as doubles in Core Data. When you need to get the information again get the doubles back from Core Data and construct a CLLocationCoordinate2D.. You should save the latitude and longitude as doubles in Core Data. When you need to get the information again get the doubles back from Core Data and construct a CLLocationCoordinate2D struct with a function like CLLocationCoordinate2DMake . There's..

iphone / Objective C - Comparing doubles not working

http://stackoverflow.com/questions/4732645/iphone-objective-c-comparing-doubles-not-working

Objective C Comparing doubles not working I think I'm going insane. counter and interval are both doubles. This is happening on accelerometer didAccelerate.. Objective C Comparing doubles not working I think I'm going insane. counter and interval are both doubles. This is happening on accelerometer didAccelerate at an interval of .01 . counter should eventually increment to interval.. interval counter interval iphone objective c ios floating point share improve this question Don't ever compare doubles or floats with equality they might look the same at the number of significant figures your are examining but the computer..

Proper way to instantiate an NSDecimalNumber from float or double

http://stackoverflow.com/questions/5304855/proper-way-to-instantiate-an-nsdecimalnumber-from-float-or-double

issues with initialising NSDecimalNumber. There seems to be some issues relating to precision and conversion to from doubles with NSDecimalNumber . Especially when you use the initialisation members inherited from NSNumber. I knocked up the test..

what is the difference between Delegate and Notification?

http://stackoverflow.com/questions/5325226/what-is-the-difference-between-delegate-and-notification

allows you to send any object to the method as a parameter. Note that you can not send primitives such as bools floats doubles ints etc. unless they are wrapped in their respective Object wrappers. classB void DelegateMethod and then call this in..

Storing data to NSUserDefaults

http://stackoverflow.com/questions/6696558/storing-data-to-nsuserdefaults

From the documentation The NSUserDefaults class provides convenience methods for accessing common types such as floats doubles integers Booleans and URLs. A default object must be a property list that is an instance of or for collections a combination..