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How can I add 1 to a particular element in a matrix?
M = your 13x13 matrix M(1,2) = M(1,2) + 1;

6 years ago | 0

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Answered
How to determine Simplex using Nelder-Mead Algorithm in all direction?
The Nelder-Mead Simplex Method is an adaptive method that adjusts the lengths and directions dynamically. The vertices could be ...

6 years ago | 0

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Question on why tilde cannot return the opposite statement result
Precedence of ~ is hgher than >, so it gets performed first. You need to use parentheses: ~(adultdata.age>50)

6 years ago | 0

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A single column vector or an array, which is faster?
Other things you are doing in your code are likely to dominate run times. We would need to see your particular application to of...

6 years ago | 0

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Answered
Matrices and indexing ?!
[LX,LY] = ndgrid(Lx,Ly); z = LX(:)./LY(:) <= 2; LX = LX(z); LY = LY(z); LX and LY contain the number pairs that match the co...

6 years ago | 0

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how do you substitute all iterations of symbolic sin^2theta cos^2theta with 1 in this symbolic MATLAB matrix to have a more simplified output?
simplify(K)

6 years ago | 0

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Sort rows of matrix by matching column with another matrix column
E.g., assuming everything in column 31 has a match [~,x] = ismember(A(:,31),B(:,31)); Bsort = B(x,:);

6 years ago | 1

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Answered
how to find max value of a function with a for loop
Make e a vector. E.g., for i=1:length(x) e(i) = y(i) - (m*x(i)-b); % <-- Are you sure that isn't supposed to be (m*x(i) +...

6 years ago | 1

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Answered
How to solve a system of ODEs and plot the result
This is where you needed to show us the complete code and the complete error message. It is probably complaining about your init...

6 years ago | 0

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Answered
precision of calculation with Matlab
Calculators may not use the same floating point representations or arithmetic routines that MATLAB uses, so differences in the t...

6 years ago | 0

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How to code for this equation in Matlab
Assuming that f(x) is really supposed to be f(t): f = @(t)exp(j*w*t); But, you will need to have w defined prior to this.

6 years ago | 0

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Answered
Mex C file generation Linker library error
Do you already have a zzz.lib file? Normally to get your mexFunction code to link to the library you simply include it as part ...

6 years ago | 0

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Answered
rand command give different answer
rand( ) is a random number generator ... it is supposed to give a different result. doc rand If you want to start over with th...

6 years ago | 1

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Help creating an array to hold approx error from a taylor series
Generally, just index into your variable inside the loop: a_values(index) = a_err; If the indexing could be large, you would a...

6 years ago | 0

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What is the Aerospace Blockset quaternion convention?
See also the Answer in this post: https://www.mathworks.com/matlabcentral/answers/465053-rotation-order-of-quatrotate

6 years ago | 0

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angle between three points (in 3D)?
See the discussion in these links: https://www.mathworks.com/matlabcentral/answers/101590-how-can-i-determine-the-angle-between...

6 years ago | 0

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How to convert char to uint8 and vice versa without changing the underlying data
Simply: c = original char array u = uint8(c); Or u = original uint8 array c = char(u); If you mean you want to reinterpret...

6 years ago | 0

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Multiplying each column of a matrix with a specific value
mat=[2,1,0,0;1,0,0,0;0,0,0,1]; % 2D matrix f = [25,5,10,1]; % row vector result = f .* mat; % element-wise multiply with virtu...

6 years ago | 0

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Answered
Creating Unit vectors in a loop
Since a complete answer has already been posted, I will post this one using a cell array result which will be much easier to ind...

6 years ago | 1

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When i run this code i get error using dec2bin (too many input arguments).
MATLAB is case sensitive. Text (uppercase T) is different from text (lowercase t). In the future, please post the complete erro...

6 years ago | 0

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Maclauren Series Iteration. Answer provided just having trouble getting code to run properly
Some issues: 1) This line: new_cos=(old_cos-(x^n))/(factorial(n)); You are dividing the old_cos by the factorial(n). This do...

6 years ago | 1

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Answered
Model a simple circular satellite orbit in time
Since you are setting up a circular orbit, just scale the time by the period to get theta. E.g., since one period would be an an...

6 years ago | 0

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Question: Create a function that takes a generic matrix, x, and finds the smallest value in the matrix.The function must work for matrices of any size and dimension.
Hint: First reshape the input x array into a 1D vector and work with that inside your function.

6 years ago | 1

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Answered
How to wrap on overflow when transfer a double to integer
You could use: y = mod(x,double(intmax('uint16'))+1); But, if x is too large so that eps(x) > 1 the result might be somewhat m...

6 years ago | 1

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Answered
Finding all multiples of 5 or 7 from 1 to 10000 with a loop.
An basic outline of the for loop to get you started: n = 10000; % the limit of the for loop x57a = []; % initialize the result...

6 years ago | 0

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What type of function Matlab has help to construct symmetric matrix?
If no specific properties needed, then you could use n = the desired size M = rand(n); M = M + M';

6 years ago | 1

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Matrix dimensions must agree error in FOR loop
This comparison: z == 'no' compares z to a 1x2 array. And this comparison z == 'yes' compares z to a 1x3 array. So you are...

6 years ago | 0

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Calling C functions using MATLAB.
This: void (*camp)(double x, double *y, int n, double *f) is not a function as you claim. It is a pointer to a function that ...

6 years ago | 0

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Can't figure out what I am doing wrong. Looking to find square root using the equation given x=(x+x/a)/2. I also feel like I am not making use of the approximation errors ea and es.
You can't do these assignments in this order: x_old=x; ea=((x-x_old)/x)*100; The first one will cause the second one ...

6 years ago | 1

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Coupled second order ODE with three variables
Problems: 1) Units. You really should annotate ALL of your constants with descriptions and units so that the reader knows what...

6 years ago | 0