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# Stijn Haenen

##### Last seen: Today
56 total contributions since 2019

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function serialportlist is not working
I do not know if i have such a device. I want to play audio files via different USB speakers, do you have any tips how to do thi...

19 hours ago | 0

Question

function serialportlist is not working
When I use the function 'serialportlist' to identify the serial ports on my laptop i get a 1x0 empty string array. ports=serial...

1 day ago | 1 answer | 0

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How can I extract values from an N x 2 matrix?
What about this?: cord=zeros(1,2); for i=1:100 xx = input('Enter x coordinates in the form [0]'); yy = input('Enter ...

5 days ago | 0

Replace -99 with NaN
x=[1 2 -99 3 4 -99 5 6 -99]; x(x==-99)=NaN;

5 days ago | 0

Custom colour bar, excluding the Blue from RGB.
Maybe you can try this: h=figure(); A = [200 200 200 200 200; 200 200 200 200 200; 200 200 100 200 200; 200 200 200 200 200; 2...

9 days ago | 0

Error: Inner Matrix Dimension Must Agree
you should use " .* " instead of " * " .

9 days ago | 1

Index exceeds matrix dimensions error
You should use ( and ) not { and }. Try this code: t=zeros(10,1); for n=1:10 if n/2>2 t(n)=t(n-1)+1 end end

14 days ago | 0

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How can I get the column number of a matrix with smallest error to my value?
Mybe you can use: [x,y,z]=find(....)

14 days ago | 0

Efficient way of selecting columns of a matrix
You can get the data from different columns also in two (maybe more?) ways: a=[1:10;11:20;21:30]; tic for i=1:10000 a(:,...

17 days ago | 0

How can I convert all string cells in a table to numerical values?
If you use the import data tool, you can chose to ouput the data in matrix instead of a table. With this tool you can also gene...

19 days ago | 1

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How can I use a loop to maximize correlation of multiple graphs?
Maybe something like this can help you: clear Y_data=[ones(1,40)*-6,-6:-2/20:-8,ones(1,140)*-8]; %just an example for x1=1:19...

19 days ago | 0

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Why does cumtrapz return negative values?
Your X and Y are from high value to low values, resulting in negative areas. use fliplr() to mirror arrays X and Y. X=[0.5056 ...

27 days ago | 1

Adding values from columns 1:i for each column for a new matrix of the same size
Something like this? matrix=[1 2 3; 1 2 3; 1 2 3; 1 2 3]; for i=1:size(matrix,2) matrix_new(:,i)=sum(matrix(:,1:i),2); e...

27 days ago | 0

input image without writing a path directory in the code
maybe you can use this: https://nl.mathworks.com/matlabcentral/fileexchange/73801-adding-all-subfolders-of-a-certain-base-folde...

27 days ago | 0

Submitted

Adding all subfolders of a certain (base)folder to the path.
This code will add every subfolden within a certain base folder to the searchpath.

Draw horizontal lines using for loop on set of images
Maybe this works: Color=[255,255,0]; %color in 8bit, [255 255 0] is yellow width=3; %width of the line Line_Y_coor=[500 60...

2 months ago | 1

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Mean of certain elements within a matrix
I think this will work: for i=1:371 Mean_i(i)=mean([matrix(i,5:6),matrix(i+1,2:4)]); end

2 months ago | 0

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How do I plot error bar at only one location ?
just plot first without errorbar and than with errorbar for only the 4th value: plot(u,v,'b') hold on errorbar(u(4),v(4),err(...

2 months ago | 0

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How to use loops to plot add graphs to a plot depending on checkbox selection
Which matlab version do you have? I have 2019a and it works. What do you see if you typ in the command window: fig.Children ...

2 months ago | 0

How to draw multiple rectangular diffraction pattern
Somthing like this? clc clear all lambda=632e-9; k=(2*pi)/lambda; a=1e-3; b=4e-3; d=20e-3; Io = 100.0; R = 1; Y = (-0.4e-...

2 months ago | 0

how to randomize a vector as fast as possible
this is finished in 28 sec, i dont know how fast other methods are. tic Vec=1:125000; numelVec=numel(Vec); new_Vec=zeros(1,n...

2 months ago | 0

How to use loops to plot add graphs to a plot depending on checkbox selection
I think you can use this script as an example: close all fig = figure; checkbox_USD = uicontrol(fig,'Style','Checkbox','Strin...

2 months ago | 0

How to plot? Having a issue.. Need to plot evolution of the norm of a symbolic matrix for t=0 to 1.
Your PHI is a 4x4 matrix, do you want to plot 16 function against t? That can be done with: syms t PHI=[ 1, t, t/3 - (2*exp(...

2 months ago | 0

How to use loops to plot add graphs to a plot depending on checkbox selection
You can get the value of the checkbox number i with v=fig.Children(i).Value So maybe you can make a for loop like this: figu...

2 months ago | 0

How to plot? Having a issue.. Need to plot evolution of the norm of a symbolic matrix for t=0 to 1.
you should use fplot or ezplot (https://nl.mathworks.com/help/symbolic/ezplot.html) to plot a 'sym' variable.

2 months ago | 0

How to plot Gantt Chart for job shop scheduling?
Do you mean something like this: Number_of_tasks=20; width=200/Number_of_tasks; startDates=1:20; endDates=3:22; for i=1:Num...

2 months ago | 0

Plotting Terminal velocity Vs particle diameter
With this script you overwrite vt and dp every loop, so at the end you only have 1 single value for vt and dp and you cannot plo...

2 months ago | 0

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Loop is not running in Matlab
There are some errors in your script: i=0.0015:-0.0015:0.00001; Only gives the number 0.0015 as output, if you want that i goe...

2 months ago | 0

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Random shuffle vector such that all elements fall in new index positions
Try this: v=[1:100]; %your vector List=1:numel(v); for i=1:numel(v) newList=List; newList(i)=[]; newpos=datasa...

2 months ago | 0