Fixes constant (init) meta data values

Previously pose, arm, xDir were reporting ZOH on initial values for all
time due to a bug in the sync<data>() and add<data> functions in
myo_class.hpp

MyoMex/MyoMex.m

@@ -48,7 +48,7 @@
     timerStreamingData
     nowInit
     DEFAULT_STREAMING_FRAME_TIME = 0.040
-    NUM_INIT_SAMPLES = 4
+    NUM_INIT_SAMPLES = 5
   end
 
   methods

MyoMex/myo_mex/myo_class.hpp

@@ -104,11 +104,11 @@ class MyoData
       timestampIMU = ts;
       // fill pose, arm, and xDir up to the new countEMG
       myo::Pose p = pose.back();
-      while ( pose.size()<countIMU ) { pose.push(p); }
+      while ( pose.size()<(countIMU-1) ) { pose.push(p); }
       myo::Arm a = arm.back();
-      while ( arm.size()<countIMU ) { arm.push(a); }
+      while ( arm.size()<(countIMU-1) ) { arm.push(a); }
       myo::XDirection x = xDir.back();
-      while ( xDir.size()<countIMU ) { xDir.push(x); }
+      while ( xDir.size()<(countIMU-1) ) { xDir.push(x); }
     }
   }
 

MyoMex/myo_mex/myo_mex.cpp

@@ -31,6 +31,7 @@ const char* output_fields[] = {"quat","gyro","accel","pose","arm","xDir","emg"};
 #define STREAMING_TIMEOUT    5
 #define INIT_DELAY        1000
 #define RESTART_DELAY      500
+#define READ_BUFFER          2
 
 // program state
 volatile bool runThreadFlag = false;
@@ -231,15 +232,15 @@ void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
     mxArray *outData2[NUM_FIELDS];
 
     // Initialize output matrices for myo 1
-    szIMU1 = collector.getCountIMU(1)-1;
-    szEMG1 = collector.getCountEMG(1)-1;
+    szIMU1 = collector.getCountIMU(1)-READ_BUFFER;
+    szEMG1 = collector.getCountEMG(1)-READ_BUFFER;
     makeOutputIMU(outData1,szIMU1);
     makeOutputEMG(outData1,szEMG1);
 
     // Initialize output matrices for myo 2
     if (countMyos>1) {
-      szIMU2 = collector.getCountIMU(2)-1;
-      szEMG2 = collector.getCountEMG(2)-1;
+      szIMU2 = collector.getCountIMU(2)-READ_BUFFER;
+      szEMG2 = collector.getCountEMG(2)-READ_BUFFER;
       makeOutputIMU(outData2,szIMU2);
       makeOutputEMG(outData2,szEMG2);
     }