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Mark Whirdy


28 total contributions since 2012

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Answered
Split matrix across the median
a = rand(5,10); b = repmat(median(a,1),10); c1 = a; c1(a<b) = NaN; c2 = a; c2(a>=b) = NaN; .... what you're lookin...

7 years ago | 0

Answered
Loading multiple files into the same database
In semi-pseudo code below My_array = []; % container for all file contents for i = 1:size(Name_File_Array) fid = fope...

7 years ago | 0

Answered
Convert an acceleration time graph, into a velocity time graph.
I'm not sure its a matlab issue as such but you'd need to know the starting velocity at least. If we assume its zero, then I thi...

7 years ago | 0

| accepted

Answered
Loading multiple files into the same database
Hi Bob Can you read the contents of all files into matlab in loop, vertically concatenating the cellarrays and perform a sing...

7 years ago | 0

Answered
computation for each date
doc xlsread doc movavg doc accumarray

7 years ago | 0

Answered
from cell array to numeric vector
MWDIData_pop(1,1:5) = {[3752373],[3876616],[4006236],[4140773],[4279524]}; % square brackets in a cellarray indicates that t...

7 years ago | 0

| accepted

Answered
from cell array to numeric vector
yearCellArray = {'2008';'2009';'2010'}; yearVector = cellfun(@str2double,yearCellArray);

7 years ago | 1

Answered
Can I use this formula??
not really a matlab question, google it

7 years ago | 1

Answered
How to vectorize a find
a temporary vector of row numbers, then use your vector-of-interest & a logicsl statement to index this row-number vector ...

7 years ago | 0

Answered
How can we achieve interfacing of two GUI's?
if you just put the name of gui2 inside the callback of the pushbutton of gui1, then gui2 does not open? gui1_mybutton_...

7 years ago | 0

Answered
How to store matrix values in a vector?
Hi Peter Finding it a little difficult to totally grasp what you want to do e.g. m is a 3d matrix & not a 2d one, right? M...

7 years ago | 0

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Answered
memory leak using activex to save multiple excel files
are you not closing the workbooks?

7 years ago | 0

Solved


Remove the vowels
Remove all the vowels in the given phrase. Example: Input s1 = 'Jack and Jill went up the hill' Output s2 is 'Jck nd Jll wn...

7 years ago

Solved


Check if sorted
Check if sorted. Example: Input x = [1 2 0] Output y is 0

7 years ago

Solved


Find all elements less than 0 or greater than 10 and replace them with NaN
Given an input vector x, find all elements of x less than 0 or greater than 10 and replace them with NaN. Example: Input ...

7 years ago

Solved


Determine if input is odd
Given the input n, return true if n is odd or false if n is even.

7 years ago

Solved


Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

7 years ago

Solved


Project Euler: Problem 1, Multiples of 3 and 5
If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23...

7 years ago

Solved


Is my wife right?
Regardless of input, output the string 'yes'.

7 years ago

Solved


Remove any row in which a NaN appears
Given the matrix A, return B in which all the rows that have one or more <http://www.mathworks.com/help/techdoc/ref/nan.html NaN...

7 years ago

Solved


Find the sum of all the numbers of the input vector
Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

7 years ago

Solved


Column Removal
Remove the nth column from input matrix A and return the resulting matrix in output B. So if A = [1 2 3; 4 5 6]; and ...

7 years ago

Solved


Select every other element of a vector
Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

7 years ago

Solved


Make the vector [1 2 3 4 5 6 7 8 9 10]
In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

7 years ago

Solved


Reverse the Words (not letters) of a String
*Description* Change the words of a string such that the words appear in reverse order. You may assume that the string is a n...

7 years ago

Answered
remove numbers from a name
welcome to the frustrating world of regular expressions!! regexp(name,'[a-z]\w+','match') all the best, Mark

7 years ago | 1

Answered
Vectorize double loops with constraints on the indexes
Hi Anne-Claire I can make some progress in the vectorization here (code below) but there are a few issues. 1) The r=max(k-...

7 years ago | 0

Answered
How to overcome the error message in the script below -Matrix dimension error - due to different size array manipulation
Hi Jan The error I get is ??? Index exceeds matrix dimensions. Since PT_mj is a [3*4] matrix and we are trying to...

7 years ago | 0