# David J. Mack

### UniversityHospital Zurich

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**Content Feed**

how to compute running correlation coefficient

And again... Have a look at <https://ch.mathworks.com/matlabcentral/fileexchange/65342 MOVCORR> Greetings, David

5 years ago | 1

How to compute sliding or running window correlation coefficient?

If someone encounters this problem, I have written a function in analogy to the MOVSUM function, which compute the moving Pearso...

5 years ago | 0

Rolling correlation / moving correlation

Hey Mate, I have written a function in analogy to the MOVSUM function, which does exactly that: <https://ch.mathworks.com/...

5 years ago | 0

How to find next number divisible by n

How about b = n * ceil(a / n) Greetings, David

5 years ago | 0

Find RR Interval in seconds

The obvious solution would be: rrInSec = rrInSamples / samplingRateInHz

5 years ago | 1

| accepted

Change legend width after reisze of legend line length

Hey Simon, this is an issue which pops up regularly, since the customization options of legends are currentyl (when I last ch...

5 years ago | 0

How to delete a plot in UIAxes?

You could store the handle to the fitted line in the UserData of the figure and then retrieve it every time the button is hit an...

5 years ago | 1

| accepted

Grouping multivariant data for Andrewsplot

Hey! So |andrewsplot| states that "The rows of X correspond to observations, the columns to variables". It seems that you hav...

5 years ago | 0

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How changing the loglog scale x and y axis?

Have you tried to use <https://ch.mathworks.com/help/matlab/ref/semilogy.html semilogy> instead of |loglog|, e.g.: semilogy...

5 years ago | 1

Increase nonzero values without deleting zeros

Hey monmatlab, simply use logical indexing: Y = X; isNonzero = X~=0; Y(isNonzero) = 10*Y(isNonzero); or the more ...

5 years ago | 1

| accepted

A very quick question

Hey Radoslav, In general, to convert a logical array to ids use |<http://www.mathworks.com/help/matlab/ref/find.html find>|. ...

5 years ago | 0

How to create a new matrix adding vectors of different size based on time

Hey Robert! First, a conceptual question: Can you make sure you have the same sampling interval & phase across all your signa...

6 years ago | 1

| accepted

Plotting a lattice with color coded nodes

Hey Bill! % Generate the random values on the 50x50, 2-dimensional lattice directly % using X = randi(imax,sz1,...,szN)...

6 years ago | 0

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How can I adjust the labels on contour lines in a 'meshc' 3D-plot?

Hey Ibrahim, have a look at <https://ch.mathworks.com/help/matlab/ref/contour-properties.html |Contour Properties|> - the |La...

6 years ago | 0

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how to reduce dimensionality of features by usin pca?

To get a simply answer (whitout really adressing the problem), have a look as <https://ch.mathworks.com/help/stats/pcares.html |...

6 years ago | 0

Replication factors must be a row vector of integers or integer scalars.

nFilters/16 is probably not an integer. Depending on your needs, try round(nFilters/16) instead or use a number of filters which...

6 years ago | 1

TEXTSCAN is my personal nemesis: Quotes strings with commas

Thanks Stephen for staying with me (you where right in the first place; reading the doc carefully helps)! I finally found my ...

6 years ago | 0

Question

TEXTSCAN is my personal nemesis: Quotes strings with commas

Dear all, I thought I acquired some Matlab knowledge over the years. But |textscan| really makes me feel dumb. I can not fi...

6 years ago | 3 answers | 0

### 3

answersReplace elements in a SxS matrix with zero, in each column but in different rows

Hey Miroslav, have you looked at the |<http://www.mathworks.com/help/matlab/ref/sub2ind.html sub2ind>| function? Should be so...

6 years ago | 1

What does "something = cell (size(session,1),1" mean/look like?

Hey Marie, the above creates a column cell with n elements, where n are the number of rows of session. Cheers, David

6 years ago | 1

Import and find a specific number from a text file

Try use regexp: file='c:\Users\David J. Mack\Desktop\test.txt'; numFormat1 = {'[ ]{1,7}(\-?\d+\.\d{3})'}; %e.g. %12.3f ...

6 years ago | 0

how to plot auto correlation and cross correlation function in a single figure?

The negative autocorrelation is the same as the positive as you use the same signal for the correlation. So if you want to pret...

6 years ago | 0

3D plot of an equation with 3 variables

Hey Amruth, have a look at |<https://www.mathworks.com/help/matlab/ref/surf.html surf>|. Use the surf(x,y,z,c) syntax. Gre...

6 years ago | 0

Creating an arbitrary number of displaced Gaussian

Hey Jason, <https://www.mathworks.com/help/matlab/ref/bsxfun.html BSXFUN> is your friend (and your enemy w.r.t. readability): ...

6 years ago | 0

interp1 - rant

If its only about the 1x1xN array not working, simply use <https://www.mathworks.com/help/matlab/ref/squeeze.html squeeze>. E.g....

6 years ago | 1

How can I label my EEG-data plotting in gui?

Is your data all in the same |axes| or in separate |subplot| s? In the first case use the |text| function and set its |'Unit'| p...

6 years ago | 0

Counting Plotted Coordinates in image

If you have your 2xN dot matrix |dots| which presumably contain the x (row 1) and y (row 2) coordinates, then N is the number of...

6 years ago | 0

No dublicates in for loop.

Hey Kian, I am not sure if I really understood your problem, but maybe the following solution helps: %Assuming NumeriskD...

6 years ago | 0

| accepted

I have a datafile contains data sets (size 200* 15) .how can I apply on all the data a lowpass butterworth filter of 2-order with cutoff fre 10 HZ

Hey Rahul, use <http://www.mathworks.com/help/matlab/ref/filter.html FILTER> with the coefficients created with <http://www.m...

6 years ago | 0

| accepted

How to get Ones along the diagonal

The built-in function <http://www.mathworks.com/help/matlab/ref/diag.html DIAG> is your friend: X = diag(ones(5,1)) Gree...

6 years ago | 2