swift - Cannot subscript a value of type 'Double' with an index of type 'Double' -


have subscript error here i'm not sure why. time made sure types matched i'm getting error because match.

cannot subscript value of type '[double]' index of type 'double' 

let maxperiod:double = 1.5   let minperiod:double = 0.1  let invalidentry:float = -100 let maxperiodstostore:double = 20 let averagesize:int = 20   class detector {      let session = avcapturesession()     var camera : avcapturedevice?      var upvals: [float] = []      var downvals: [float] = []      var upvalindex: int?     var downvalindex: int?      var lastval: float?     var periodstart: float?     var periods: [double] = []     var periodtimes: [double] = []      var periodindex: int?     var started: bool?     var freq: float?     var average: float?      var wasdown: bool?       func reset() {           var i:double = 0; < maxperiodstostore; i++ {             periods[i] = invalidentry // error: cannot subscript value of type '[double]' index of type 'double'         }         var i:int = 0; < averagesize; i++ {             upvals[i] = invalidentry             downvals[i] = invalidentry         }         freq = 0.5         periodindex = 0         downvalindex = 0         upvalindex = 0     }

original objective-c code

// detector.m  #import <quartzcore/quartzcore.h> #import "detector.h" #import <vector> #import <algorithm>  #define max_period 1.5 #define min_period 0.1 #define invalid_entry -100  @implementation detector  @synthesize periodstart;   - (id) init { self = [super init]; if (self != nil) { // set invalid [self reset]; } return self; }  -(void) reset { for(int i=0; i<max_periods_to_store; i++) {     periods[i]=invalid_entry; } for(int i=0; i<average_size; i++) {     upvals[i]=invalid_entry;     downvals[i]=invalid_entry; }      freq=0.5;   periodindex=0;   downvalindex=0;   upvalindex=0; }   // detector.h   #import <foundation/foundation.h>  #define max_periods_to_store 20 #define average_size 20 #define invalid_period -1  @interface detector : nsobject {   float upvals[average_size]; float downvals[average_size]; int upvalindex; int downvalindex;  float lastval; float periodstart; double periods[max_periods_to_store]; double periodtimes[max_periods_to_store];  int periodindex; bool started; float freq; float average;  bool wasdown; }  @property (nonatomic, assign) float periodstart;    -(float) addnewvalue:(float) newval attime:(double) time;  -(float) getaverage;  -(void) reset;  @end

if you're going paste mess of code question, should give clear indication of line giving error.

i did @ code , found problem. should not use loop double index array. instead change loop use int variable, , cast double if need math with other doubles.


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