for loop - How can I compute the time it takes Matlab to do gaussian elimination for various sized matrices? -


this code have far compute how long takes, on average, matlab implement gaussian elimination on matrix of size n=200:

ntr=50; % number of trials n=200; % matrix size  times=zeros(ntr,1); % vector of timing data ntr trials  i=1:ntr  % form random matrix , right-hand side b (normally distributed) a=randn(n,n); b=randn(n,1);  % apply backslash , calculate time taken tic; x=a\b; times(i)=toc;  end  n mean_time=mean(times)

how can modify code computes various values of n such n=200, 500, 1000, 3000 etc? tried loop randn can take in scalar values... end result looking plotting loglog graph of n values against average time taken. appreciated!

you should set vector size want evaluate , in loop define n n=all_the_n(i). way randn take scalar value , iterate on different n.

all_the_n=[100 200 300 400]; %matrix size ntr=4; times=zeros(ntr,1);  i=1:ntr  n=all_the_n(1,i); a=randn(n,n); b=randn(n,1);  f=@() a/b; times(i,1)=timeit(f)  end

Comments

Post a Comment

Popular posts from this blog

Magento/PHP - Get phones on all members in a customer group -

i working on custom magento extension. working around adminhtml part , i've created custom form there. here form code: <?php class vivasindustries_smsnotification_block_adminhtml_sms_sendmass_edit_form extends mage_adminhtml_block_widget_form { public function _preparelayout() { $extensionpath = mage::getmoduledir('js', 'vivasindustries_smsnotification'); $head = $this->getlayout()->getblock('head'); $head->addjs('jquery.js'); $head->addjs('vivas.js'); return parent::_preparelayout(); } protected function _prepareform() { $form = new varien_data_form(array( 'id' => 'edit_form', 'action' => $this->geturl('*/*/save', array('id' => $this->getrequest()->get...
Read more

php - Bypass Geo Redirect for specific directories -

i'm trying bypass redirect specific url within site. wondering if might able help. the code below code use, original urls replaces example.com i'd able access http://example.com/admin without redirect occuring. is there way this, , there way using own ip? function country_geo_redirect() { $country = getenv('http_geoip_country_code'); if ($country == "us" ) { wp_redirect("http://usa.example.com/"); exit; } else if ($country == "gb" ) { wp_redirect("http://uk.example.com/"); exit; } } add_action('init', 'country_geo_redirect'); you can bypass redirection code if server found ip address. if ip address == <my ip address> ' nothing here else country_georedirect() end if
Read more

php - .htaccess mod_rewrite for dynamic url which has domain names -

i want convert url ex:( example.com/link.php?url=facebook.com ) ( example.com/facebook.com.php ) how can using .htaccess. or there other process make job easier ? i tried adding script .htaccess file options +followsymlinks rewriteengine on rewriterule url-(.*)\.htm$ link.php?url=$1 but converting url adding "url-" ( example.com/url-facebook.com.php ) i want remove "url-" , want make ( example.com/facebook.com.php ) rewriteengine on rewritecond %{the_request} ^get.*link\.php\?url\= [nc] rewritecond %{request_uri} !/system/.* [nc] rewriterule (.*?)link\.php\?url\=/*(.*) /$1$2 [r=301,ne,l] not sure how above work edit of used use remove index.php url
Read more