arrays,matlab,loops,math,for-loop , Matlab: Writing to a file

Matlab: Writing to a file


Tag: arrays,matlab,loops,math,for-loop

I want to store mean_2....mean_8, std_2....std_8, and coVariance as separate columns in a file. Help Please?

This Code calculates IntervalFeatures of Erp signal with 256 time frames and plots them Datapoints are store in A


each 1x4 sliding sub-matrix is made a column for eg:- if A is 1x6 you would get 1-2-3-4, 2-3-4-5, 3-4-5-6 each as a column ending with 3 columns. for 1x10 matrix, you would get 7 columns

calculating the mean of every column

Subtract each value of the column with the mean value of corresponding column finally element-wise squaring, mean of each column and then element-wise sqrt to get the output.


reshaped_2 = im2col(A,[1 2],'sliding');
mean_2 = mean(reshaped_2);
out1 = bsxfun(@minus,reshaped_2,mean_2);
std_2 = sqrt(mean(out1.^2))

reshaped_4 = im2col(A,[1 4],'sliding');
mean_4 = mean(reshaped_4);
out2 = bsxfun(@minus,reshaped_4,mean_4);
std_4 = sqrt(mean(out2.^2))

reshaped_8 = im2col(A,[1 8],'sliding');
mean_8 = mean(reshaped_8);
out3 = bsxfun(@minus,reshaped_8,mean_8);
std_8 = sqrt(mean(out3.^2))

begInt = 1;
endInt =256;
l=endInt - begInt + 1;
arrayCovar = zeros(1,257);
for k=1:256

coVar = 1/l *((A(k)*k) - (mean(A(k:j))*((begInt + endInt)/2)));
j= 1+k;

coVariance = arrayCovar(:,1:256);


If you want to get the matrices to be displayed in each column, that's going to be ugly. If I'm interpreting your request correctly, you are concatenating row vectors so that they appear as a single row. That's gonna look pretty bad.

What I would suggest you do is split them up so that each row vector is separated per line. Use dlmwrite for that:

dlmwrite('data.txt', mean_2);
dlmwrite('data.txt', ' ', '-append');
dlmwrite('data.txt', mean_4, '-append');
dlmwrite('data.txt', ' ', '-append');
dlmwrite('data.txt', mean_8, '-append');
dlmwrite('data.txt', ' ', '-append');
dlmwrite('data.txt', std_2, '-append');
dlmwrite('data.txt', ' ', '-append');
dlmwrite('data.txt', std_4, '-append');
dlmwrite('data.txt', ' ', '-append');
dlmwrite('data.txt', std_8, '-append');
dlmwrite('data.txt', ' ', '-append');
dlmwrite('data.txt', coVariance, '-append');


How to force my output data in a inputdlg on Matlab be a double?

I'm currently using a MATLAB to work and I need some help: I need to convert my output data (variable: units) be a double instead of a cell because I must perform a sum: units = inputdlg(question,title); sum = units + i; I've tried this code also but didn't solve...

pointer to pointer dynamic array in C++

I've been having bad luck with dynamic pointers when I want to close it. why the application wrote to memory after end of heap buffer? how can I close my array? int main() { . . int **W; W = new int* [n]; for (int i=1; i <= n; i++)...

Segmentation Fault if I don't say int i=0

void removeVowels(char* array){ int i,j,v; i=0; char vowel[]={'a','e','i','o','u'}; while(array[i]!='\0') { for(v=0;v<5;v++) { if (array[i]==vowel[v]) { j=i; while(array[j]!='\0') { array[j]=array[j+1]; j++; } i--; break; } } i++; } } in function removeVowels() if I don't include i=0; and just say int i; why does it give segmentation fault? Isn't it automatically...

Notice: Array to string conversion in “path of php file” on line 64

PHP CODE -: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" ""> <html xmlns=""> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Untitled Document</title> </head> <body> <?php $rows =0; $fp = fopen("leave1.csv","r"); if($fp){ while(!feof($fp)){ $content = fgets($fp); if($content) $rows++; } } fclose($fp); //echo $rows; $_SESSION['rows'] = $rows; ?>...

Having two arrays in variable php

i've this code, i'm trying to explode my date e.g "04 June 2015" to have the day and the month in other 2 variables, but i have all in a method, with an array, is it possible, my code doesn't work, it writes "Array[0]" why? while ($i < $number) {...

Animate through multiple 2D Matlab plots

I have multiple 2D line plots in Matlab (they represent some wave moving through space). Each plot represents the wave at some time t. I want to animate through these plots (i.e. show the first plot for a fraction of a second, then show the next one, and the next,...

Javascript sort array of objects in reverse chronological order

I have an array of objects which holds a list of jobs and I would like to sort them in reverse chronological order as they would appear on a resume for example. I came up with the below solution which 'seems' to work but I was wondering if there is...

what does ellipsis mean in a Matlab function's argument list?

What is the ellipsis for in this Matlab statement? frame = insertObjectAnnotation(frame, 'rectangle', ... bboxes, labels); ...I could not find in their online doc....

Connecting two binary objects in matlab

I have a binary matrix containing several binary objects and I want to bridge between them. Actually I have the following picture: And the result has to be like this: Is there any function or a shortcut way, other than loops, for this problem?...

How to innerHTML a function with array as parameter?

I am learning about looping thorugh arrays - I want to pass the result of an if else statement in the forEach function (inside another function with array as parameter) to HTML using innerHTML (does not have to be innerHTML if you know better methods I do not mind). It...

How do I print more than one value per key in Tcl?

array set array_in_twos { set1 table set2 chair set1 chair } foreach combo [array names array_in_twos] { puts "$combo is $array_in_twos($combo)," } outputs: set1 is chair, set2 is chair, It seems the second 'set 1' replaces the first 'set 1'. how do i print all? set1 is table, set2 is...

Why black surf from this Matlab command?

Code tfr = abs ( tfr ); [row_size, column_size] = size(tfr); tfr = tfr(1:round(row_size/2), 1:row_size); surf(tfr); view(2); I get in R2014b of OSX 10.10.3 Yosemite but rotating around shows that the cells should not be black Why is the output black? I wonder if this is a hardware problem or...

function wait to execute

In Matlab functions can be started at events,but occasionally, like with the resize function, the events are called in rapid order and the function is called many times in succession, which can cause weird behavior and lag. Is there a way to have it listen for the event but only...

Reading all the files in sequence in MATLAB

I am trying to read all the images in the folder in MATLAB using this code flst=dir(str_Expfold); But it shows me output like this. which is not the sequence as i want. Can anyone please tell me how can i read all of them in sequence? for giving downmark, please...

Javascript function to validate contents of an array

Here's what is asked: validItems(items) – this function receives a string array of items which are to be for a customer. The function returns an empty string indicating all item codes in the array are valid; otherwise the function returns the first invalid item code in the array. All item...

Matlab — SVM — All Majority Class Predictions with Same Score and AUC = .50

I'm having a weird problem in training an SVM with an RBF kernel in Matlab. The issue is that, when doing a grid search, using 10-fold cross-validation, for the C and Sigma values I always get AUC values equal to approximately .50 (varying between .48 and .54 depending) -- I...

Zipping two arrays together with index in Scala?

I have two arrays populated with integers. They are the same size (val array1 and val array2). I want to fuse them together into tuples with their index as the third element. For example if we have val array1 = Array(5,2,6,2) and val array2 = Array(9,8,3,4) then I want to...

How to check if data already exists then randomly generate new data from an Array

Okay so, I made an array containing 270+ different strings. The main goal is too echo out 60 strings from that array and combine them.. Ex. 1.String, 1.String2. The 2 echo'd out strings are a combination, and should be together like 1-1 and 2-2, 3-3, and ect. In total there...

Matlab - Multiply specific entries by a scalar in multidimensional matrix

I'm having problems multiplying specific values within my multidimensional matrix by a scalar. My matrix has the following dimension: size(comDatabe) = 5 10 3 397 10 The third dimension is an x-y-z coordinate frame. Something went wrong and now my y-axis is defined upside down for one subject (#8 out...

Interpolation inside a matrix. Matlab

I have a matrix looks like: 0 0 0 0 0 1 0 0 0 0 0 2 0 0 0 0 0 2 0 0 0 0 0 1 0 1 0 0 0 1 0 4 0 0 0 0 0 3 0 0 6 0 0 4...

How to pivot array into another array in Ruby

I have a multidimensional array like this one : myArray = [["Alaska","Rain","3"],["Alaska","Snow","4"],["Alabama","Snow","2"],["Alabama","Hail","1"]] I would like to end up with CSV output like this. State,Snow,Rain,Hail Alaska,4,3,nil Alabama,2,nil,1 I know that to get this outputted to CSV the way I want it I have to have output array like this: outputArray =[["State","Snow","Rain","Hail"],["Alaska",4,3,nil],["Alabama",2,nil,1]]...

How to normalise polynomial coefficients in a fraction?

I have the following code: syms z Gc=1.582*(1-0.3679*z^-1)/(1+.418*z^-1); Ghp=.3679*(z^-1)*(1+.718*z^-1)/((1-z^-1)*(1-.3679*z^-1)); T=(Gc*Ghp)/(1+Gc*Ghp); clipboard('copy', latex(simplifyFraction(T))); Which results in following for T: How can I normalise coefficients? I.e. I want the z2 in denominator and z in numerator to have the coefficient of 1. Is there any function in Matlab to do so?...

Create array from another with specific indices

I have two arrays, one of data and one of indices: var data = [ 'h', 'e', 'l', 'l', 'o', ' ' ]; var indices = [ 4, 0, 5, 0, 1, 2, 2 ]; I would like to create a third array, using cells of data in order indicated...

Perl: Using Text::CSV to print AoH

I have an array of hashes (AoH) which looks like this: $VAR1 = [ { 'Unit' => 'M', 'Size' => '321', 'User' => 'test' } { 'Unit' => 'M' 'Size' => '0.24' 'User' => 'test1' } ... ]; How do I write my AoH to a CSV file with separators,...

Merge and sum values and put them in an array

I'm retrieving values from an external source and apply a foreach loop to the results, with the code below. angular.forEach(data, function(value, key) { if (value.start_date > firstdayOfWeek && value.start_date < lastdayOfWeek) { console.log(value.firstname + ' - ' + value.distance); } else { //do nothing } }); The result is console...

matlab plots as movie with legend

i have a question regarding legend for movies. This is my code: fig = figure(); for i = 1: 70000 plot(signal1) hold on; plot([i,i],[-5,5]) plot(signal2,'r') hold off; title('\fontsize{14} my data'); legend('signal1','signal2'); axis tight; f(i) = getframe(fig); end The legend shows the same colors for the first two things I plot....

Split an array into slices, with groupings

I've got some Ruby code here, that works, but I'm certain I'm not doing it as efficiently as I can. I have an Array of Objects, along this line: [ { name: "foo1", location: "new york" }, { name: "foo2", location: "new york" }, { name: "foo3", location: "new york"...

array and function php

I'm just a beginner in PHP coding. I've been reading through a tutorial, but having some trouble with basic PHP concepts. If you could help me, I'd be much obliged. I'm having trouble understanding why the following code doesn't work. <?php function sum($x, $y) { $z = $x + $y;...

Array in Foreach (CodeIgniter)

I want to use array in foreach loop but failed, here is my code: foreach($this->db->get_where('mytable', array('result' => '1 or 2', 'id' => 'foo'))->result_array() I think 'result' => '1 or 2'piece has a problem but I couldn't find out how can I use array in this kind of foreach. I want...

Substring of a file

I have a file that is structure like this : var file = "a|b|c|d, a|b|c|d, a|b|c|d, a|b|c|d, a|b|c|d"; Now I would extract all letters "c" and "d" of this file and put those letter in array, structure like this: var array = [ [a,b,1], [a,b,2], [a,b,3], [a,b,4], [a,b,5] ]; How...

jQuery - Value in Function

My array: = "Thiago"; = "01/01/1990"; I want a function like this: function myFunc( array, fieldToCompare, valueToCompare ) { if( array.fieldToCompare == "Thiago" ) alert(true); } myFunc( myArray, name, "Thiago" ); is it possible?...

Array JLabel ActionListener multiple JPanels

I have an array of JLabels and I want to add an ActionListener to them. Every label should display a panel and the other should be removed. How can I realize this?

SCALA: change the separator in Array

I have an Array like this. scala> var x=Array("a","x,y","b") x: Array[String] = Array(a, x,y, b) How do I change the separator comma in array to a :. And finally convert it to string like this. String = "a:x,y:b" My aim is to change the comma(separators only) to other separator(say,:), so...

Javascript: Labeling array results

Alright so here is my Html code: <html> <head> <title>Planning</title> <script type="text/javascript" src="Function.js"></script> </head> <body> <form id="form"> <h1><b>Please enter data</b></h1> <hr size="3"/> <br> <label for="Name">Name:</label> <input id="Name" type="text" /> <br> <label for="Date">Date: </label><input id="Date" type="text" /> <br> <label for="Plans">Plans:...

How to switch Matlab plot tick labels to scientific form?

I have a semilogarithmic plot which works so far with semilogx. Now I would like to change the tick labels. Now it says 10^8 10^9 ... 10^13, but I would like to see 1e8, 1e9, ... 1e13 on the x-axis. How can I change that? Cheers Manuel...

accessing range of values in arduino array

I have data packet coming in like this in Arduino. Data: 12345678901234 I can access the 5th value using the code below. id =[4]; My question is how do I access a rang of values? I tried this, but the colon throws an error. char[2] id; if( sx1272.packet_received.length >...

Select word between two words

How can I create a function that selects everything between the words X and Y and pushes it to an array. By Greili - 4 Hours and 40 Minutes ago. #NsShinyGiveaway 0 comments By ToneBob - 4 Hours and 49 Minutes ago. #NsShinyGiveaway 0 comments By hela222 - 5 Hours...

How to access variables in the properties block of a Matlab System Object?

I am working on a simple System Object in Matlab/Simulink. It looks like this : classdef realtime_header_detectorSO < matlab.System & matlab.system.mixin.Propagates % correlateHeader % % This template includes the minimum set of functions required % to define a System object with discrete state. properties Header %nrOfBitsInPreviousStep=0; s=100; d=zeros(1,s); end properties...

How to pass array in rails 4 strong parameters

I have to pass a array of food_item_ids in my order_controller. Every order will have many food_items. How can I pass these food_items_id as an array in strong parameters. orders_controller.rb def create @order = if render :json, @order, status:201, location: [:api, @order] else render :json, { errors: @order.errors...

Comparing arrays with numbers in

I need a way to compare two arrays in and save result in third array: Dim KonRes(3) As Integer Dim UserRes(3) As Integer Dim YelRed(3) As Integer KonRes(0) = 1 KonRes(1) = 2 KonRes(2) = 3 KonRes(3) = 4 UserRes(0) = 4 UserRes(1) = 3 UserRes(2) = 2 UserRes(3)...

Blank screen on GridView

I'm trying to create a GridView with an array of strings. These are XML, and MainActivity and Adapter, but what I get is a blank screen. I'm change the background, but the result is the same, but clicking on a point on the screen appears to me the toast stating...

Ruby: How to copy the multidimensional array in new array?

seating_arrangement [ [:first, :second, :none], [:first, :none, :second], [:second, :second, :first], ] I need to copy this array into new array. I tried to do it by following code: class Simulator @@current_state def initialize(seating_arrangement) @@current_state = seating_arrangement.dup end But whenever I am making any changes to seating_arrangement current_state changes automatically....

most efficient way to create javascript array out of various php arrays

I have a form that a user can submit multiple times, adding different information each time. These form inputs are translated into php $_SESSION arrays, so each time the user hits the submit button, the array grows. This is working fine. I need to bring these over into javascript but...

Get elements containing text from array

I want to search all the elements containing any string in the array. For example I have following list of items <ul> <li>cricket bat</li> <li>tennis ball</li> <li>golf ball</li> <li>hockey stick</li> </ul> and this array var arr = ['bat', 'ball']; It should select all the elements having text bat and ball....

Translating a character array into a integer string in C++

I was trying to achieve translating a character array into a integer string and corresponding character to their alphabetical order. For instance: A(a) = 0 , Z(z) = 25. string key_char = argv[1]; string key_num; for (int i = 0; i < key_char.length(); i++){ if (isalpha(key_char[i])){ if (islower(key_char[i])){ key_num[i] =...

Infinite loop with fread

I'm trying to allocate an array 64 bytes in size and then loop over the array indexes to put a read a byte each from the inputfile. but when I don't malloc() the array indexes, the loop stays in index0 (so each time it loops it replaces the content in...

thicken an object of image to a curve in matlab

I have a labeled matrix containing two objects. How can I thicken an object to a curve? Actually I have the following image: and I want this: Each pixel of the resulting curve is the median of each column. But if you have another idea, it is acceptable, because I...

C++ & Qt: Random string from an array area

In my small Qt application, I want to pick a random string out of an array after I clicked on a button. I've read many threads but nothing works for me. So in my slot there's an array with several strings in it. I also implemented <string>, <time.h> and srand....

do calculation inside JSONArray in Java

I have a simple issue but cannot solve it as I am not very good at algorithm! I have an JSONArray in this form: [{"values":[{"time":1434976493,"value":"50"}, {"time":1434976494,"value":"100"}],"counter":"counter1"}, {"values":[{"time":1434976493,"value":"200"}, {"time":1434976494,"value":"300"}],"counter":"counter2"}, {"values":[{"time":1434976493,"value":"400"}, {"time":1434976494,"value":"600"}],"counter":"total"}] What I want to do is to get the integer value for counter 1 and counter 2 and then divide...

Plot multiple functions on one figure

I'm struggling to plot multiple functions on one figure. Here is the code that I have: syms t a; a=0.9514; F1=0.5*sqrt(3*t^2); F2=-0.28375*t^2+1.155*a*(t-a)+1; F3=1; E1=diff(F1,t); E2=diff(F2,t); E3=diff(F3,t); I want to plot E1, E2 and E3, each only within a certain range, to make a "composite" line. I've tried plotting with ezplot...