# Karim

Mechanical Engineer

**Programming Languages:**

Python, MATLAB

**Spoken Languages:**

English

**Professional Interests:**

Optimization, Multibody Modeling, Finite Element Analysis (FEA)

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**Content Feed**

Discretize model dx dt = σx − σy, dy dt = xρ − xz − y, dz dt = xy − βz, using Runge-Kutta methods (of order 2 or order 4).

After having a look at the wikipedia article (Lorenz system - Wikipedia), it appears that you have some mistakes in your equatio...

12 months ago | 1

Evaluating all possible combinations

See below for one method to obtain all combinations. In the resulting matrix, each row represents a combination, the first colu...

12 months ago | 0

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How do I fill colour on both sides of the sin wave in this graph?

One way to do this is by using the ployshape function from matlab, see below for a demonstration. % Define the time axis (x-axi...

12 months ago | 0

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how to use mesh to plot 3D image?

I assume you want to create a 3d surf plot? You can use the method below. u1=4;u2=8;a=30;b=5;a2=100;A=500;c2=10;c3=12;c4=8;D0=1...

1 year ago | 1

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How to find heading angle between two coordinates

see below for one approach % random generate point position and direction of the robot currPos = 1+10*(rand(1,2)); % the x-y c...

1 year ago | 1

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Remove '00' the first two digit to '0' in cell

Hi, you can do that with the startswith function of matlab: ab = {'10300' '20257' '30073' '40080' '55011' '82132' '0' '0' '0'; ...

1 year ago | 0

I WANT TO CREATE MATRIX COMBINATION

% setup the original data, note the shape! A = [1;2;3]; B = [4;5;6]; % create the combinations C = [ repmat(A,numel(B),1) ...

1 year ago | 1

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Find Z-value corresponding to X and Y points based on interpolated data

Note that you have very little points. Hence one possibility is to perform linear interpolation, below you can see one method on...

1 year ago | 0

Readin a txt file and exporting the data in a matrix.

you can use the readmatrix function, remember to se the decimal seperator to a comma for you data % 'format long' is only used ...

1 year ago | 0

convert cell array into date and time string

See below for one method on how to do this % reconstruct the cell array from the OP date_hne = {'2014' '04' '01' '23' '46' '44...

1 year ago | 0

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Best method to create multi-dimensional data set?

You could store this in a cell array. See below for a demonstration and some comments on the concept: num_models = 10; num_set...

1 year ago | 0

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3D color map of F=F(x,y,z) where data is given as a 2D array of the form [x y z F]

Hello , you can create those plots both for both 2D and 3D elements using the patch command. Essentially you need a connecitivty...

1 year ago | 1

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Creating a projection of a surface on a plane for area calculation.

There is no need for rotations or even fine sampling, since it's a pyramid it has straight edges. If you project the points that...

1 year ago | 1

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How do I make line stacked graph like this?

Hi, its much easier if you would provide the numerical data as numerical data and not a screenshot ;) Anyhow, yes such a plot c...

1 year ago | 1

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Hi Everyone. Ive created a set of questions for user to select the material characteristics based on their preferences and need help to choose best results best on their ans

Hi, see below for some possibilities on how to code such selection. % material options Materials = ["AS";"AA";"PL";"PC"]; S...

1 year ago | 0

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I am trying to solve a system of linear equations generated from a 2-D finite element problem. The equations (shown below) are not in the general form Ax=B..

Well to figure out the simple analytic equation you can in fact use the symolic toolbox to investigate the set of equations. Not...

1 year ago | 0

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How to find the value before max value for vector for each 10 rows

Hi see below for the stept to obtain such a vector % set up the 'max row value indicator' n = 10 % create array A A = 1:100 ...

1 year ago | 0

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MATLAB Interface for NOAA Data

Using inspiration from this answer: How to get daily temperatures of past 30 years for a given location from NOAA online databas...

1 year ago | 0

Can you please tell me what is the error ?

you forgot a * in -6*x(b-2*y)/(a^3*b) this should be -6*x*(b-2*y)/(a^3*b) see below E=70*10^6; v=0.3; p=50*10^3; h=0.01; a...

1 year ago | 0

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Plot Surface from Sum of Series

Hi you need to set up a grid for each point that you want to evaluate. Afterwards you need to evaluate your function at each poi...

1 year ago | 1

why am I getting an error for this tutorial when adapted to my image? how can I fix this error:

Assuming you are reffering to this tutorial: Color-Based Segmentation Using the L*a*b* Color Space - MATLAB & Simulink Example -...

1 year ago | 1

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Limiting range of a matrix

You can use logical indexing to obtain such a result, see below for a demonstration A = [1 2 3 4 5 6 7 8]; % define the limi...

1 year ago | 0

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fsolve with vectors x and y (not x(1) x(2))

Based on the comments, I would guess that you are looking for 8 parameters i.e. syms x [1 4]; x syms y [1 4]; y can you try m...

1 year ago | 1

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Unable to perform assignment because the indices on the left side are not compatible with the size of the right side.

@Kamilu Sanusi, based on your comments I tried to update the code. The code runs without errors, but you will have to verify whe...

1 year ago | 1

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How to reduce its execution time?

Hi, I vectorized your code. Using tic/toc procedure the run time is about 0.04 seconds. Hope it helps. tic % transpose u a...

1 year ago | 0

Use a for loop to find out if point B is away from point A by a known amount

Hi see below for a demonstration of such a loop. % load the data sortedmat = importdata("sortedmat.txt"); % set the allowed d...

1 year ago | 0

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Finding closest circle to a general circle

You could try to fit a plane trought each circle, comput the normal of that plane. And then determine the angle between the norm...

1 year ago | 0

Plotting far away objects in a 3D plot

Those are some amazing plots! One method that could work is to insert a "break" in the axis, i.e. hiding a part of the space be...

1 year ago | 0

Is there any way to save my processed Images into different folders?

Yes this is possible, below you can find some pseudo code showing the logic behind the process. Hope it helps. EDIT: updated t...

1 year ago | 0

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A symbolic implementation issue

I'm not fully sure I understand what your are looking for. However, if the goal is to create arrays which hold symbolic equation...

1 year ago | 0