Java从for循环中查找最小值
我在寻找最小距离时遇到了一些问题,然后从最小距离开始,我在地图上画了两个圆Java从for循环中查找最小值,java,for-loop,minimum,Java,For Loop,Minimum,我在寻找最小距离时遇到了一些问题,然后从最小距离开始,我在地图上画了两个圆 double distance = 0; double minDistance; convertedHotSpotGeomList = RetrieveHotSpotAsyncTask.convertedHotSpotGeom; for(int i = 0; i
double distance = 0;
double minDistance;
convertedHotSpotGeomList = RetrieveHotSpotAsyncTask.convertedHotSpotGeom;
for(int i = 0; i < convertedHotSpotGeomList.size(); i++){
LatLng point1 = new LatLng(convertedHotSpotGeomList.get(i).getY(), convertedHotSpotGeomList.get(i).getX());
LatLng point2 = new LatLng(convertedHotSpotGeomList.get(++i).getY(), convertedHotSpotGeomList.get(++i).getX());
distance = calculateHotSpot(point1, point2);
Log.i("DIST", String.valueOf(distance));
minDistance = distance;
if(minDistance < distance){
minDistance = distance;
Log.i("MIN", String.valueOf(minDistance));
CircleOptions circleOptions = new CircleOptions()
.center(point1)
.radius(1000)
.fillColor(Color.argb(95, 178, 30, 37))
.strokeColor(Color.TRANSPARENT);
googleBasemap.addCircle(circleOptions);
CircleOptions circleOptions1= new CircleOptions()
.center(point2)
.radius(1000)
.fillColor(Color.argb(95, 88, 130, 37))
.strokeColor(Color.TRANSPARENT);
googleBasemap.addCircle(circleOptions1);
}
}
双倍距离=0;
双重心态;
convertedHotSpotGeomList=检索HotspotSyncTask.convertedHotSpotGeom;
对于(int i=0;i
目前,我得到15,3,15,14作为DIST,但我不能得到Mindsist,因为它没有打印出来。有什么想法吗
提前感谢。您可能需要:
distance = calculateHotSpot(point1, point2);
....
if(distance < minDistance){
minDistance = distance;
更新:
更完整的解决方案,因为上述问题并非唯一的问题:
double minDistance = Double.MAX_VALUE;
convertedHotSpotGeomList = RetrieveHotSpotAsyncTask.convertedHotSpotGeom;
LatLng[] minPoints = new LatLng[2]; // save the minimum points
for(int i = 0; i < convertedHotSpotGeomList.size(); i++){
LatLng point1 = new LatLng(convertedHotSpotGeomList.get(i).getY(), convertedHotSpotGeomList.get(i).getX());
LatLng point2 = new LatLng(convertedHotSpotGeomList.get(++i).getY(), convertedHotSpotGeomList.get(++i).getX());
distance = calculateHotSpot(point1, point2);
Log.i("DIST", String.valueOf(distance));
if(distance < minDistance){
minDistance = distance;
Log.i("MIN", String.valueOf(minDistance));
minPoints[0] = point1;
minPoints[1] = point2;
}
}
// we finish all the comparison, so we draw the circles now
if(minPoints[0]!=null && minPoints[1] !=null){
CircleOptions circleOptions = new CircleOptions()
.center(minPoints[0])
.radius(1000)
.fillColor(Color.argb(95, 178, 30, 37))
.strokeColor(Color.TRANSPARENT);
CircleOptions circleOptions1= new CircleOptions()
.center(minPoints[1])
.radius(1000)
.fillColor(Color.argb(95, 88, 130, 37))
.strokeColor(Color.TRANSPARENT);
googleBasemap.addCircle(circleOptions);
googleBasemap.addCircle(circleOptions1);
}
double minDistance=double.MAX_值;
convertedHotSpotGeomList=检索HotspotSyncTask.convertedHotSpotGeom;
LatLng[]最小点=新LatLng[2];//保存最低分数
对于(int i=0;i
您可能需要:
distance = calculateHotSpot(point1, point2);
....
if(distance < minDistance){
minDistance = distance;
更新:
更完整的解决方案,因为上述问题并非唯一的问题:
double minDistance = Double.MAX_VALUE;
convertedHotSpotGeomList = RetrieveHotSpotAsyncTask.convertedHotSpotGeom;
LatLng[] minPoints = new LatLng[2]; // save the minimum points
for(int i = 0; i < convertedHotSpotGeomList.size(); i++){
LatLng point1 = new LatLng(convertedHotSpotGeomList.get(i).getY(), convertedHotSpotGeomList.get(i).getX());
LatLng point2 = new LatLng(convertedHotSpotGeomList.get(++i).getY(), convertedHotSpotGeomList.get(++i).getX());
distance = calculateHotSpot(point1, point2);
Log.i("DIST", String.valueOf(distance));
if(distance < minDistance){
minDistance = distance;
Log.i("MIN", String.valueOf(minDistance));
minPoints[0] = point1;
minPoints[1] = point2;
}
}
// we finish all the comparison, so we draw the circles now
if(minPoints[0]!=null && minPoints[1] !=null){
CircleOptions circleOptions = new CircleOptions()
.center(minPoints[0])
.radius(1000)
.fillColor(Color.argb(95, 178, 30, 37))
.strokeColor(Color.TRANSPARENT);
CircleOptions circleOptions1= new CircleOptions()
.center(minPoints[1])
.radius(1000)
.fillColor(Color.argb(95, 88, 130, 37))
.strokeColor(Color.TRANSPARENT);
googleBasemap.addCircle(circleOptions);
googleBasemap.addCircle(circleOptions1);
}
double minDistance=double.MAX_值;
convertedHotSpotGeomList=检索HotspotSyncTask.convertedHotSpotGeom;
LatLng[]最小点=新LatLng[2];//保存最低分数
对于(int i=0;i
您的问题在于相邻的这两行:
minDistance = distance;
if(minDistance < distance){
minDistance=距离;
if(距离<距离){
因此,首先将MindDistance设置为distance的值。然后检查MindDistance是否小于distance。由于MindDistance永远不会小于您刚才设置的值,因此该代码块将永远不会计算。您的问题在于相邻的两行:
minDistance = distance;
if(minDistance < distance){
minDistance=距离;
if(距离<距离){
因此,首先你要将MindDistance设置为距离值。然后你要检查MindDistance是否小于距离。因为它永远不会小于你刚才设置的值,所以这段代码永远不会计算。我不明白,你在寻找最小的距离