math - Summing array values java -


i'm feeding in array of length 8 if trials 100 might of form 93 5 2 0 0 0 0 0, whatever values have in array 0.6 back. if can see if i'm making stupid error great. i've tried loop keep getting 0.6.

static void getmetric(int[]a, int trials){     double metric = 0;     int =0;     while(i<8){         if(i==0){             double x = (a[0] / trials) - (2 / 15);             metric += math.abs(x);             i++;         }         else if(i>0 && i<7){             double x = (a[i] / trials) - 0.1;             metric += math.abs(x);             i++;         }         else{             double x = (a[7] / trials) - (2 / 15);             metric += math.abs(x);             system.out.println(""+metric);             i++;         }     } }

it looks need double-division , not int-division. remember:

int = 96; int b = 100; double c = / b; //will 0.0!

so following program should same, more correct, think (and shorter):

static void getmetric(int[] a, int trials){     double metric = math.abs((((double)a[0]) / trials) - (2 / 15));      (int = 1; < 7; i++) {         metric += math.abs((((double)a[i]) / trials) - 0.1);     }      metric += math.abs((((double)a[7]) / trials) - (2 / 15));      system.out.println(""+metric); }

and 1 more reable , robust:

static void getmetric(int[] a, int trials){     double metric = calcmetricdiff(a[0], trials, 2.0 / 15.0);      (int = 1; < a.length - 1; i++) {         metric += calcmetricdiff(a[i], trials, 0.1);     }         metric += calcmetricdiff(a[a.length-1], trials, 2.0 / 15.0);      system.out.println(""+metric); }     private static double calcmetricdiff(double val, int trials, double diff) {     return math.abs((val / trials) - diff); }

Comments

Post a Comment

Popular posts from this blog

c++ - Is it possible to compile a VST on linux? -

for class project i'm attempting write vst plugin backed cuda. current cuda workflow on linux box, i'd prefer compile , link there. according wikipedia , should possible (i couldn't find steinberg documentation relevant linux) can't find makefile or instructions on how build if aren't using xcode or visual studio. i'm vst 3 sdk doesn't support linux. when try compile plugin under linux, error: ./base/source/fatomic.cpp:39:30: fatal error: libkern/osatomic.h: no such file or directory this issue caused following code in "vst3 sdk/base/source/fatomic.cpp" #if mac #include <libkern/osatomic.h> #if mac_os_x_version_min_required > mac_os_x_version_10_4 #define native_atomic_type (volatile int32_t*) #else #define native_atomic_type (int32_t*) #endif #elif windows #include <windows.h> #endif but hope compiling under linux work vst sdk 2.4. reading. jvstwrapper seems run on lin...
Read more

c# - SharpSVN - How to get the previous revision? -

i trying find efficient way previous revision of file text comparison using sharpsvn. using (svnclient c = new svnclient()) { c.authentication.defaultcredentials = new networkcredential( configurationmanager.appsettings.get("svnserviceusername") , configurationmanager.appsettings.get("svnservicepassword") , configurationmanager.appsettings.get("svnservicedomain") ); c.authentication.sslservertrusthandlers += new eventhandler<svnsslservertrusteventargs>(authentication_sslservertrusthandlers); collection<svnfileversioneventargs> fileversioncollection = new collection<svnfileversioneventargs>(); svnrevisionrange range = new svnrevisionrange(0, this.hooks.revision); svnfileversionsargs args = new svnfileversionsargs(); args.retrieveproperties = true; args.range = range; foreach (svnchangeitem item in log.changedpaths) { string path = this.repositorypath + it...
Read more

php cli reading files and how to fix it? -

while using php cli in ubuntu got apache web server cant read file can while using in browser. , error shows nothing , next used code testing purposes : <? $handle = fopen("testfile.txt", "r"); if ($handle) { while (($buffer = fgets($handle, 4096)) !== false) { echo $buffer; } if (!feof($handle)) { echo "error: unexpected fgets() fail\n"; } if(!is_readable($handle) { die("not readable"); } fclose($handle); } ?> how fix ? edit : after removing '@' before fopen got following error fopen(testfile.txt): failed open stream: no such file or directory in /var/www/log/ka.php on line 2 when run script through cli, uses shell's working directory, in opposition file's directory (which apache hands current directory). important you, since fopen call depends on relative path; , relative paths resolved relatively working directory, not script. to have script behave apache, eit...
Read more