excel - How can I implement for-loop to calcuate partial area of the curve in MATLAB? -


i have large data set in excel file having 100 rows , 300 columns. first row name of variable (y1:y300), rest of data numeric. interested calculate partial auc present between 2 fixed points of x axis. using @shellfish solution how calculate partial area under curve matlab?. want implement loop can calculate partial area every y value y1 y300. how can use for-loop achieve this? used code..i imported .xls file using matlab import function.

    data = importfile('test.xls','sheet1','a2:az100');     y1 = data(:,1);     y2 = data(:,2);     y3 = data(:,3);     y4 = data(:,4);     y5 = data(:,5); ... x = [-1000:10:1000];  startingindex = find(x==-350); endingindex = find(x==-100);  desiredx = x(startingindex:endingindex); desiredy = y1(startingindex:endingindex); area = trapz(desiredx,desiredy); area

my try for-loop calculate desiredy every time 

for i=y1:y100     desiredy = i(startingindex:endingindex);     area = trapz(desiredx,desiredy);     area end

but thing terribly wrong code..not working.

it great, if me correct code.

there's couple things wrong here. first, can't define iterators for loop that. second, there's no reason explicitly define y1, y2, ..., yn, can address data array directly. fingers hurt thinking typing of out :(

using linked question sample data , code:

% set sample data data = rand(100,3); x = 0:100;  startingindex = find(x == 20); endingindex = find(x == 80); desiredx = x(startingindex:endingindex);  % preallocate [nrows, ncolumns] = size(data); desiredy = zeros(ncolumns, 1); area = zeros(ncolumns, 1);  ii = 1:ncolumns     desiredy = data(startingindex:endingindex, ii);     area(ii) = trapz(desiredx, desiredy); end

this goes through every column of data , performs linked integration, storing result in area. each index of area corresponds column in y.


Comments

Post a Comment

Popular posts from this blog

powershell Start-Process exit code -1073741502 when used with Credential from a windows service environment -

i'm running strange behavior powershell start-process call. here call: $process = start-process ` "c:\somepath\mybinary.exe" ` -passthru ` -credential $defaultcredential ` -wait ` -workingdirectory "c:\somepath" ` -loaduserprofile if ($process.exitcode -ne 0) { #do } this call return exit code - 1073741502 . after quick search, exit code seems related generic error when program not load required dll (aka. status_dll_init_failed ). when run without -credential $credential program runs correctly. in order isolate problem, manually launched some.exe in prompt target credential , runs smoothly. so problem seems come way start-process cmdlet launch process. i found potential solutions problem tried apply no luck : link , link . would have idea of what's going on here ? edit 1: run proc mon monitoring program activities when launched directly or via powershell script. problem seems occur when loading kernelbase
Read more

twig - Using Twigbridge in a Laravel 5.1 Package -

i'm trying create laravel 5.1 package uses twigbridge instead of .php views. can normal .php views display fine, when try make use of .twig templates i'm met error. possible use twigbridge templates when creating views laravel package or pretty stuck blade , php ? edit 1: loading twig template without extending works. it's when start using {% extends 'file' %} error comes out. i error error loading /virtual/laravel/packages/username/mypackage/src/views/sample.twig: template "templates.master" not defined () in "/virtual/laravel/packages/username/mypackage/src/views/sample.twig" @ line 1. my folders username |_ mypackage |_ src |_ controllers - samplecontroller.php |_ views |_ templates - master.twig - sample.twig twig template sample.twig {% extends 'templates.master' %} {% block content %} {{ parent()
Read more

c# - LINQ join Entities from HashSet's, Join vs Dictionary vs HashSet performance -

i have hashset's each stores t, have written test application compares different relation algorithms can think of, i'm not pleased results getting. does there exist more efficient ways of achieving object relations, once testing? using system; using system.collections.generic; using system.linq; using system.text; using system.threading.tasks; using system.diagnostics; namespace linqtests { class program { static void main(string[] args) { hashset<user> usertable = new hashset<user>(); hashset<userproperty> userpropertytable = new hashset<userproperty>(); #region lets create dummy data. console.writeline("please wait while creating dummy data, can take while..."); console.writeline(""); int rows = 1000000; for(int x = 0; x < rows; x++) { random rnd = new random(); // ad
Read more