# Jonas

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C++, Java, MATLAB

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**Content Feed**

i want to know the fitness

i guess you are seraching for the correlation of X and Y coordinates see corr() and corrplot()

4 days ago | 0

How do I plot grid points in a wedge-shaped volume?

you could add the third dimension like that: x=-6:6; [X,Y,Z]=meshgrid(x); r=5; phi=pi/2; % from [0,pi] theta=pi/4; % ...

5 days ago | 0

MATLAB 2022b removing spaces from strings in concatenation?

"For character array inputs, strcat removes trailing ASCII whitespace characters: space, tab, vertical tab, newline, carriage re...

6 days ago | 1

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How can i find the Majoraxislength and Minoraxislength of each cell present in binary image ?

a call to regionprops should suffice: clear; im=imread("image.png"); im=rgb2gray(im); % to grayscale im=im~=0; % make bina...

6 days ago | 0

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Name points on a plot based on their order

you could add the line text(ri(:,1),ri(:,2)+0.05,cellstr(num2str((1:size(ri,1))'))) or text(ri(:,1),ri(:,2)+0.05,strsplit(num...

6 days ago | 0

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Traslate and Rotate a point cloud

if you have a matrix nx3, with each row being one set of point corrdinates you can translate first and rotate afterwards using s...

6 days ago | 0

Replacing special character 'É' to 'E'

looks like there are only manual solutions. Stackoverflow is your friend ;-) https://stackoverflow.com/a/60181033

7 days ago | 0

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How to find the count of vertical lines in an image using Fourier Transform in MATLAB?

% create sample image imgLine=repmat([ones(1,5) zeros(1,20)],[1 10]); % shift it a bit to force broken (incomplete) lines i...

7 days ago | 1

Sorting group position from 1

i think you are searching for this: [~,~,c]=unique([2 3 2 1],'stable') [~,~,c]=unique([3 3 1 2],'stable')

7 days ago | 1

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How to filter out files with a list of specific string in UIGETFILE command?

you can provide mutiple filters to choose from: uigetfile({'EFA*.xls;EFB*.xls'},'Select a File'); this shows EFA*.xls files an...

7 days ago | 1

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Hold on and Hold off command keeps all plots on subsequent graphs

do you want the second part into another axes or also into another figure? syms x eqn1 = x^2*cos(x); d_eqn1 = diff(eqn1,x); ...

7 days ago | 0

How to compare blank spaces in arrays?

use this a=["red","blue","green","yellow"]; b=["orange","","","purple"]; c=a(b=="")

7 days ago | 0

error in prctile function?

did you read the documentation? there is an example given for the interpolation and how the given numbers may be distributed. Yo...

11 days ago | 0

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Question

Abbreviate regexp: match a if present, else match b

dear community, can someone abbreviate the follwing if else in a single regexp? str1='this is } and this is }, and this is }';...

26 days ago | 1 answer | 0

### 1

answerwrite a function to return next value each time only nonzeros

if I understand correctly you want the function the be able to remember how often the function was called. each time the next no...

2 months ago | 0

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The description of interp said, 'interp inserts zeros into the original signal and then applies a lowpass interpolating filter to the expanded sequence'

the description says it inserts zeros AND applies the filter for interpolation. of course the filter changes the zero values. ...

3 months ago | 0

How to set position of legend plot where outside axes??

add a Name-Value pair to your legend command, e.g. legend('Location','eastoutside')

3 months ago | 0

How do you remove tick marks (not labels) from a colorbar?

try c=colobar; c.TickLength=0;

3 months ago | 0

FFT on Image Time Series

if the object of your camera is more or less static and illuminated with a temporally modulated light source and you are intere...

4 months ago | 1

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Issue with reading text value from a cell in MS Excel using readmatrix

if i am not mistaken, readmatrix expects numbers for each entry, so the numbers can be but into a matrix. if your data contains ...

4 months ago | 1

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Matlab keeps giving me error for invalid syntax! I don't understand why

looks like you are missing a comma if d>0 fprintf('Le soluzioni distinte sono %12.2f \n',A1 , A2) ...

4 months ago | 1

Store one vector range inside another

put the : range expression in the braces to select a range if a vector: vec=1:10 part=vec(5:8)

4 months ago | 0

Changing pixel colors of .JPG image produces weird colors

dont forget to set all 3 channels of the rgb image to 0 by using e.g. app.newImage(:, round(col),:) = 0

5 months ago | 1

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Plot figure for certain elements of readtable output

you can use directly index the variables of the table: tbl=table(); tbl.long=[1 2 3 4 4 4]; tbl.lat=[34 56 57 72 44 124]; ...

5 months ago | 0

delete row in matrix if value in another matrix is unique

you want to delete entries when the number is repeated first? firstVec=[5 3 5 1 7 9 3 1 4]; secVector=1:numel(firstVec) [~,...

5 months ago | 0

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Extracting only some cell arrays from a cell- based on a double array

something like this: yourCell=cellstr(num2str((1:29)'))' someOfThemIdx=[ 1 3 15 19 20 29]; someOfThem=yourCell(someOfThemIdx)...

5 months ago | 1

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Return values from uifigure by pressing OK button

if you nest functions in functions, you can directly use the defined variables. note also the uiwait to wait for the functio nre...

5 months ago | 0

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How do I create a graph similar to that of the example below?

you could do like this loglog([ 10^2 10^2 10^4 10^4 10^2],[ 10^4 10^6 10^6 10^4 10^4]); hold on; loglog([ 1 10^2 10^4 10^4],[...

5 months ago | 0

How to create image from arrays by random themself ?

a = [119 79 76 101 119 99 72 77 94 82 76 84 92 86 63 54 45 47 59 69 56 59 52 48 48 41 41 38 41 42 38 42 36 30 35 17 23 29 29 31 ...

5 months ago | 0

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How to find column where 0 turns to 1 for each row

yourMat=[0 0 0 0 0; 0 1 1 0 0; 0 0 0 1 0]; where=arrayfun(@(idx)find(diff(yourMat(idx,:))==1,1,'first')+1,1:size(your...

5 months ago | 0