column-sum | 易学教程

codeigniter - how to add up values in table column

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问题 Trying to get the sum of the values entered within a column (af_am_msm) from my table (non_clinical_total_tests). I want to display that total within an html table. My error message is: A PHP Error was encountered - Severity: Notice - Message: Array to string conversion My MODEL: public function af_am_sum() { $this->db->select_sum('af_am_msm'); $query = $this->db->get('non_clinical_total_tests'); return $query->result(); } My CONTROLLER: public function index() { $data['af_am_total'] = $this-

How do I divide matrix elements by column sums in MATLAB?

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Is there an easy way to divide each matrix element by the column sum? For example: input: 1 4 4 10 output: 1/5 4/14 4/5 10/14 gnovice Here's a list of the different ways to do this ... ... using bsxfun : B = bsxfun(@rdivide,A,sum(A)); ... using repmat : B = A./repmat(sum(A),size(A,1),1); ... using an outer product (as suggested by Amro ): B = A./(ones(size(A,1),1)*sum(A)); ... and using a for loop (as suggested by mtrw ): B = A; columnSums = sum(B); for i = 1:numel(columnSums) B(:,i) = B(:,i)./columnSums(i); end Update: As of MATLAB R2016b and later, most built-in binary functions (list can be

How do I divide matrix elements by column sums in MATLAB?

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问题 Is there an easy way to divide each matrix element by the column sum? For example: input: 1 4 4 10 output: 1/5 4/14 4/5 10/14 回答1: Here's a list of the different ways to do this ... ... using bsxfun: B = bsxfun(@rdivide,A,sum(A)); ... using repmat: B = A./repmat(sum(A),size(A,1),1); ... using an outer product (as suggested by Amro): B = A./(ones(size(A,1),1)*sum(A)); ... and using a for loop (as suggested by mtrw): B = A; columnSums = sum(B); for i = 1:numel(columnSums) B(:,i) = B(:,i).