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# Ameer Hamza

### Hong Kong Polytechnic University

874 total contributions since 2016

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Control of Robotic arm using Simulink and ROS
Simulink example models to demonstrate the use of ROS together with hardware support packages to create a multi-node robotic sys...

Error about “Maximum recursion limit of 500 reached”
The problem is happening in |Bubble_point_T()| function. You are recursively calling it, and the termination condition is i...

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Must be in the front row...
You are given a matrix followed by a single number. Your object is to write a script that will shift the matrix around so that ...

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Too Many Zeros, Dump Them!
Sometimes when I create a matrix, I use this syntax: a = zeros(1000,1000); But when the function ends, I find that I don'...

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A matrix of extroverts
Now that the introverts have had their script, the extroverts spoke up (naturally!) and demanded one as well. You will be given...

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Enlarge array
Given an m-by-n numeric array (A) and a 1-by-2 vector (sz) indicating the dimensions [p q] to enlarge each element, return an (m...

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Replace Nonzero Numbers with 1
Given the matrix x, return the matrix y with non zero elements replaced with 1. Example: Input x = [ 1 2 0 0 0 ...

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Remove entire row and column in the matrix containing the input values
Remove the entire row and column from the matrix containing specific values. The specified value can be a scalar or a vector. Fo...

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subtract central cross
Given an n-by-n square matrix, where n is an odd number, return the matrix without the central row and the central column.

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Write a function man that takes a row vector v and returns a matrix H as follows..
Write a function called man that takes a row vector v as an input and returns a matrix H whose first column consist of the eleme...

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frame of the matrix
Given the matrix M, return M without the external frame.

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reversing the inverse hyperbolic sine function
MATLAB also has hyperbolic sin <https://www.mathworks.com/help/matlab/ref/sinh.html |sinh()|> function. y = asinh(x); si...

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If condition for a large number of different numbers
<https://www.mathworks.com/help/matlab/ref/max.html |max()|> function returns both maximum value and its index. [value, ind...

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Why I can't plot a line with my function???
As Stephen pointed out, you are only plotting one point at a time, therefore the can't join to form a line. One way is to assign...

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calculate slope from linear fit data
The intercept is indeed 0.5. Intercept is the value on y-axis when |x=0|. Whereas you 2.2 is the value when |x=1|.

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how to read a text file using dlmread that is not in matlab directory?
If it is not on MATLAB path, you can still read it by specifying the correct Absolute or relative paths. For example, the follow...

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Simulink model running in "real time"
In R018a, you can go to *Simulation > Pacing Option* from the menu bar and set the simulation speed. In older versions, you will...

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could anyone help me to find the first number in the row

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undefined function or variable error in matlab simulink?
There are some typing mistakes in |ur10_forward_kinematic()|. For example in the input list the variable name is |Theta2|, where...

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How to prevent a program in matlab to ask the user enter parameters value several times
If you are using |input()| function in your code to ask for user input then you should either replace |input()| statements with ...

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How to calculate integral of a square waveform
You can use the |square()| function to create a square wave with the time period of |2*pi| and amplitude between |-1| and |1|. A...

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Why do I get the error "Array indices must either be real positive integers or logical"?
Change the following lines in your code as follow Df = diff(f,x); D2f = diff(f,x,2); i.e. remove the |(x)|. It will rem...

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Hello i'm new use matlab. i would like to use savitzky golay to smooth my data. I have the data in .txt format. Can you help me how to plot my data and use the savgol filteriing? Thank you
You can use <https://www.mathworks.com/help/signal/ref/sgolayfilt.html |sgolayfilt()|> function from Signal Processing Toolbox. ...

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rotate my countour plot without changing the axes
|rotate()| function documentation does not include |contour| objects for rotation. However, for 180-degree rotation, the followi...

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Interpolate matrices for different times in Matlab
You can use |interp3| as follow: clear all; a(:,:,1) = [1 1 1;2 2 2;3 3 3]; % Matrix 1 a(:,:,2) = [4 4 4;6 6 6;8 8 8]; % ...

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Different time response of same trasfer function in matlab and simulink
The Simulink is giving the same plot as MATLAB, the problem in the display is happening because The system step response has a v...

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hi, i want to generate a signal from simulink that activate a m-file code. how can i do that?
You can use <https://www.mathworks.com/help/simulink/slref/matlabfunction.html MATLAB function> block to use MATLAB code in Simu...

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How to put the figure on on uipanel?
You can't directly plot on the |uipanel| object. You first need to overlay an axes object in the panel and then plot on the axes...

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How to replace char 'null' in number 0?
The image shows a struct which |char| arrays as fields. You can use <https://www.mathworks.com/help/matlab/ref/strrep.html |strr...

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