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Professional Interests: Mathematical Computing

Answered

MATLAB cannot integrate trigonometry in the form of degree

Note that at the end, your answer will be in degrees....you can convert it to raidians and check. syms x f = cosd(x); % x is ...

MATLAB cannot integrate trigonometry in the form of degree

Note that at the end, your answer will be in degrees....you can convert it to raidians and check. syms x f = cosd(x); % x is ...

12 hours ago | 1

Answered

Operands on table, comparison with numbers

You have to access the columns of Table T using T.(1), T.(2) etc, Read about accessing the columns from tatble. If you have na...

Operands on table, comparison with numbers

You have to access the columns of Table T using T.(1), T.(2) etc, Read about accessing the columns from tatble. If you have na...

13 hours ago | 1

Answered

how to plot tangent of y=x^(1/2) at a point x=4 on MATLAB?

It is a MATHS question. You should know the steps of how to follow. Refer it here: https://intl.siyavula.com/read/maths/grade-...

how to plot tangent of y=x^(1/2) at a point x=4 on MATLAB?

It is a MATHS question. You should know the steps of how to follow. Refer it here: https://intl.siyavula.com/read/maths/grade-...

14 hours ago | 0

Answered

How to call n numbers from a Matrix

watlevel=[1.8; 1.5; 1.2; 1.3; 1.4; 1.6; 1.7; 1.4; 1.1; 0.9; 0.2; 0.2]; %incoming water level time=[0; 3; 6; 9; 12; 15; 18; 2...

How to call n numbers from a Matrix

watlevel=[1.8; 1.5; 1.2; 1.3; 1.4; 1.6; 1.7; 1.4; 1.1; 0.9; 0.2; 0.2]; %incoming water level time=[0; 3; 6; 9; 12; 15; 18; 2...

18 hours ago | 1

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Answered

How to know which plot is more linear then the other?

How about finding the area bounded by the curves..which ever has least area is straight. A = [0 0.423891532 0.819380304 1.2...

How to know which plot is more linear then the other?

How about finding the area bounded by the curves..which ever has least area is straight. A = [0 0.423891532 0.819380304 1.2...

19 hours ago | 0

Answered

Matrix "User Define"

What you gave is a combination of numbers and strings.....this cannot be acieved by a matrix. But you can use cell arrays for th...

Matrix "User Define"

What you gave is a combination of numbers and strings.....this cannot be acieved by a matrix. But you can use cell arrays for th...

20 hours ago | 0

Answered

Solve the equation for x

Repalce exp.^() with smply: exp() Also element by element operation not reuqired: fun = p* exp(-exp((v-x)/a)) + r* exp(-((...

Solve the equation for x

Repalce exp.^() with smply: exp() Also element by element operation not reuqired: fun = p* exp(-exp((v-x)/a)) + r* exp(-((...

1 day ago | 2

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Answered

How to get X and Y coordinates from a Sparse Matrix?

If A is your sparse matrices. You can get positions using: [y,x] = find(A) ; % x, y are the positons/indices of non-zeros ...

How to get X and Y coordinates from a Sparse Matrix?

If A is your sparse matrices. You can get positions using: [y,x] = find(A) ; % x, y are the positons/indices of non-zeros ...

1 day ago | 0

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Answered

Index exceeds the number of array elements (1).

The error is clear...you are trying to extract more number of elements than present int he array. A = rand(1,10) ; A(1) %...

Index exceeds the number of array elements (1).

The error is clear...you are trying to extract more number of elements than present int he array. A = rand(1,10) ; A(1) %...

1 day ago | 0

Answered

Plot exactly root of polynomial degree=3

p = [1 -1 0 -10] ; % polynomial coefficients r = roots(p) ; % get roots %% plot x = linspace(0,10); y = polyval(p...

Plot exactly root of polynomial degree=3

p = [1 -1 0 -10] ; % polynomial coefficients r = roots(p) ; % get roots %% plot x = linspace(0,10); y = polyval(p...

1 day ago | 0

Answered

How to vectorize matrix assignment process below

Read about sub2ind. Convert your sub indices into global indices and use. idx = sub2ind(size(A),2*i-1,2*i-1) ; A(idx) = a(i) ...

How to vectorize matrix assignment process below

Read about sub2ind. Convert your sub indices into global indices and use. idx = sub2ind(size(A),2*i-1,2*i-1) ; A(idx) = a(i) ...

1 day ago | 1

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Answered

How to calculate the value of the vector A in equation AXA' = b?

syms x y A = [x y] ; X = rand(2) ; b = rand ; eqn1 = A*X*X'- b ==0 s = solve(eqn1,x,y) ; x = double(s.x) y = double...

How to calculate the value of the vector A in equation AXA' = b?

syms x y A = [x y] ; X = rand(2) ; b = rand ; eqn1 = A*X*X'- b ==0 s = solve(eqn1,x,y) ; x = double(s.x) y = double...

1 day ago | 0

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Answered

Generating 2D Geometry with MATLAB and Exporting to FEM software

Yes it is very much possible.. but you need to enter the details of FEA/ FEM mesh in the format which software demands. Already ...

Generating 2D Geometry with MATLAB and Exporting to FEM software

Yes it is very much possible.. but you need to enter the details of FEA/ FEM mesh in the format which software demands. Already ...

2 days ago | 0

Answered

need help with writing a script that will solve the problem here is what i started with

Hints: x = linspace(0,1,100); y = linspace(0,1,100) ; [X,Y] = meshgrid(x,y) ; Z = X.^2+Y.^2 ; surf(X,Y,Z) shading interp ...

need help with writing a script that will solve the problem here is what i started with

Hints: x = linspace(0,1,100); y = linspace(0,1,100) ; [X,Y] = meshgrid(x,y) ; Z = X.^2+Y.^2 ; surf(X,Y,Z) shading interp ...

2 days ago | 1

Answered

How can I read multiple mat files and perform ttest2 function?

This question has been discussed to death. A simple search will give you lot of links. matFiles = dir('*.mat') ; N = length(...

How can I read multiple mat files and perform ttest2 function?

This question has been discussed to death. A simple search will give you lot of links. matFiles = dir('*.mat') ; N = length(...

2 days ago | 0

Answered

how do i write a matlab script to sum this expression?

N = 100; thesum = 0 ; for i = 1:N thesum = thesum+(1/i+1/((i+2)*(i+3))) ; end Without Loop: N = 100 ; f = @(i) (1....

how do i write a matlab script to sum this expression?

N = 100; thesum = 0 ; for i = 1:N thesum = thesum+(1/i+1/((i+2)*(i+3))) ; end Without Loop: N = 100 ; f = @(i) (1....

3 days ago | 1

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Answered

how to find argmin to this vector

Are you looking for something like this? Let a,b be your column matrices. [a,b] = meshgrid(a,b) ; % make them a matrix F ...

how to find argmin to this vector

Are you looking for something like this? Let a,b be your column matrices. [a,b] = meshgrid(a,b) ; % make them a matrix F ...

3 days ago | 0

Answered

How to Swap Column according to odd/even numbers?

This is basic in MATLAB. You should read about indexing an array. Example: A = rand(10,1) ; % array for demo E = A(2:2:end...

How to Swap Column according to odd/even numbers?

This is basic in MATLAB. You should read about indexing an array. Example: A = rand(10,1) ; % array for demo E = A(2:2:end...

3 days ago | 0

Answered

How to get the Z-contour values related to scatter positions?

Read about ScatteredInterpolant.

How to get the Z-contour values related to scatter positions?

Read about ScatteredInterpolant.

3 days ago | 0

Answered

Given that a=[1;4.2;3;pi;8;7;62;50;23;17]; Please use vector b to represent all the even elements in vector a (b=[8;62;50])?

Use mod to get your even numbers. a = [1; 4.2; 3; pi; 8; 7; 62; 50; 23; 17]; idx = mod(a,2) ; iwant = a(idx==0)

Given that a=[1;4.2;3;pi;8;7;62;50;23;17]; Please use vector b to represent all the even elements in vector a (b=[8;62;50])?

Use mod to get your even numbers. a = [1; 4.2; 3; pi; 8; 7; 62; 50; 23; 17]; idx = mod(a,2) ; iwant = a(idx==0)

3 days ago | 0

Answered

Can anyone tell what is this line doing

f = [1 2 4]; % this is an array can be access by f(i) where i = 1,2,3 d = {[4 2 1] [4 1 2] [4 3 5]}; % this is a cell array,...

Can anyone tell what is this line doing

f = [1 2 4]; % this is an array can be access by f(i) where i = 1,2,3 d = {[4 2 1] [4 1 2] [4 3 5]}; % this is a cell array,...

4 days ago | 0

Answered

How to obtain a group of pixels on an image

If I is an image, you can use: iwant = I(1:5:end,1:5:end,:) ;

How to obtain a group of pixels on an image

If I is an image, you can use: iwant = I(1:5:end,1:5:end,:) ;

4 days ago | 0

Answered

Plotting a kind of tree

x1 = -22.5; x2 = -37.5 ; y1 = 0; y2 = 15; x = [x1, x2, x2, x1, x1]; y = [y1, y1, y2, y2, y1]; xC = 30; yC = -30; xR = ...

Plotting a kind of tree

x1 = -22.5; x2 = -37.5 ; y1 = 0; y2 = 15; x = [x1, x2, x2, x1, x1]; y = [y1, y1, y2, y2, y1]; xC = 30; yC = -30; xR = ...

4 days ago | 2

Answered

Receiving x and y coordinates of an image.

I = imread("image.jpeg") ; [y,x] = find(I~=255) ; coor = [x y] ;

Receiving x and y coordinates of an image.

I = imread("image.jpeg") ; [y,x] = find(I~=255) ; coor = [x y] ;

4 days ago | 0

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Answered

Unable to perform assignment because the left and right sides have a different number of elements.

The error is clear; when you try to save more number of elements in an array which initiliazed with less number. Example: A ...

Unable to perform assignment because the left and right sides have a different number of elements.

The error is clear; when you try to save more number of elements in an array which initiliazed with less number. Example: A ...

5 days ago | 1

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Answered

loops and divisions by 7 and calling function

function [whatsLeft, divisionCount] = divideBySeven (number) % Enter the code for your function here. while number <1 ...

loops and divisions by 7 and calling function

function [whatsLeft, divisionCount] = divideBySeven (number) % Enter the code for your function here. while number <1 ...

5 days ago | 0

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Answered

Sign Changes (conditional through vector elements)

Refer here: https://de.mathworks.com/matlabcentral/answers/231803-how-to-determine-sign-change-in-a-matrix-for-each-coulmn-sep...

Sign Changes (conditional through vector elements)

Refer here: https://de.mathworks.com/matlabcentral/answers/231803-how-to-determine-sign-change-in-a-matrix-for-each-coulmn-sep...

5 days ago | 0

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Answered

Need help finding coordinates of an image.

The image will be plotted wrt it's indices. If I is your image. [m,n,p] = size(I) ; x = 1:n ; y = 1:m ; [X,Y] = meshgrid(x,...

Need help finding coordinates of an image.

The image will be plotted wrt it's indices. If I is your image. [m,n,p] = size(I) ; x = 1:n ; y = 1:m ; [X,Y] = meshgrid(x,...

5 days ago | 1

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Answered

Creating an 8x8 matrix using loops

Hints: 1. You can generate the number array using ':'. If I want numbers from 1 to 36. I will use l = 1:36 ; 2. Once numebrs...

Creating an 8x8 matrix using loops

Hints: 1. You can generate the number array using ':'. If I want numbers from 1 to 36. I will use l = 1:36 ; 2. Once numebrs...

5 days ago | 0