# AndresVar

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Python, C, MATLAB

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**Content Feed**

Backtrack iteration for loop

i think matlab for loop doesn't allow changing the iterator, you can use while loop instead.

4 months ago | 1

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how to know 'y' values of points when we only know 'x' values?

yes a perpendicular line has a negative inverse slope so if red lines has slope m1=(dy/dx)_red, then the black line has slope...

4 months ago | 0

How to keep Matlab from messing up the formating in my excel file?

You can writetable and then fix the column width with an actxserver fullFilename = fullfile(pwd,'mysheet.xlsx'); % or whatever ...

6 months ago | 1

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Only abnormally large outlier values are removed, not small ones

your data has zeros that make the mean closer to the small peak. you should ignore the zeros, maybe you can throw them away OR ...

6 months ago | 0

How to integrate the area below the peak when I dont have function of the peak?

Use conditional indexing to define the limits of extent for the peak. clear load("AR_data.mat") % remove nan values (why is...

7 months ago | 1

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How to properly color a surface in two different colours using surf function?

How about just 1 surface but you tweak the colormap x = linspace(-0.5, 0.5, 21); [X, Y] = meshgrid(x, x); Z = -2 * (cos(2*pi*...

7 months ago | 1

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Importing table from text file and matching header to column

I tried the import tool: Import data from file - MATLAB (mathworks.com) The code it generated for your data did not look as pre...

7 months ago | 2

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A rounding problem that falls under ceil and round

How about x=[0 20 50 100 101 900 901 1234]; % test numbers y = ceil(x/100)*100

7 months ago | 0

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translating each image column a distance according to the fitted curve

You can try circshift to shift the column vectors. But the result is not so good (i think), for example the length of the object...

7 months ago | 0

Can someone help me to remove small region area with regionprops?

try bwareaopen: Remove small objects from binary image - MATLAB bwareaopen (mathworks.com) There is an example in the documenta...

7 months ago | 0

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Performing the transform on the below logic

Make a grid, evaluate the function and use fft2 to get the spatial spectrum. Here is an example, note function might be differe...

7 months ago | 0

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Fitting multiple data sets to single curve in least square sense

x1,x2,x3 are column vectors that you combined into a matrix, so then y was evaluated to a matrix also. nlinfit expects vectors ...

7 months ago | 0

Vectorizing for loop for faster processing

You defined bin edges so you can try discretize: Group data into bins or categories - MATLAB discretize (mathworks.com) idx=1:1...

7 months ago | 0

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concatenate structures inside structures

since each frame has different sized structure array maybe you can use a cell for each frame clear; % example positions for ...

7 months ago | 1

overlap ylabel with values axis

many ways to modify the label position: modify position property, if in latex add \quad, etc the easy way is to control the hor...

7 months ago | 0

Create a patch which includes all the histogram profiles

If you can use uniform bin edges for all series then it can be simplified Here it is plotting white over the another color. You...

7 months ago | 0

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How to save each row as image in MATLAB

Edit: use rescale the entire dataset instead of each row. Edit: note in the example I put padding on the data to shape it into ...

7 months ago | 0

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Finding data on specific point from large set data

Import data (e.g. right click file -> Import data... -> generate code) Use scattered interpolant: Interpolating Scattered Data...

7 months ago | 1

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Subscript indices must either be real positive integers or logicals.

In matlab arrays are indexed starting at 1 so S_x(0) is an error. You can use another array to store the 'range' values rang...

7 months ago | 1

How to draw a letter T ? the background is black and the letter itself white

The current white block A(100:200,100:200) goes from column 100 to 200, so if you just make it longer 100:400 you will get a whi...

7 months ago | 1

Decide values of row in matrix for certain row intervals

since you are just changing the first number, use res(a:b,1)=1

7 months ago | 0

Why do I get the error saying I did not assign values to a call? I did assign my values after getting them from a function though? Anyone able to help me out and explain?

Your p assignment is lowercase but output is uppercase

7 months ago | 0

Can someone help me with this integration

you can do it without symbolic variables clear theta_s_vec = 0:0.1:pi/2; for ii = 1:numel(theta_s_vec) theta_s = theta_s...

7 months ago | 1

Multiple line with different variable in a plot

Here is an example. Loop for each B but use pi_o as a vector in your calculations. clear; pi_o = 2:2:30; B=[3 5 8]; figure...

7 months ago | 0

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How to create ROI then know the total pixel number in ROI

You can use drawcircle to create a circular roi and then make a mask form it. Then you can sum or find the number of non-zero el...

7 months ago | 0

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How can I map a specific location in MATLAB using the drone images with corresponding gps data latitude and longitude?

You can use geoplot: Plot line in geographic coordinates - MATLAB geoplot (mathworks.com) Also: Create Maps Using Latitude and ...

7 months ago | 1

Projectile Motion Equation with inputs of degree and first velocity

Here is an example Note you don't have to loop for each time value because matlab can perform calculations on the vector Note:...

7 months ago | 0

How to apply masks created by roipoly to movie?

You can store the roipoly result in a cell array like this rois = cell(1,4) for ii = 1:4 rois{ii} = roipoly(I); end Wou...

7 months ago | 0

Solving Integrations with Simpson's Rule

You need to declare Q as a function handle or use subs. syms r r0=3; Q = 4*pi*r*(1-r/r0)^(1/6); subs(Q,'r',0) %%% Alternati...

7 months ago | 0

Is there a way to make this code output a plot with curved lines?

There might be an issue with your f or your jacobian After the first th2, your f~0 so norm(f)~0 and there are no convergence it...

7 months ago | 0

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