Answered
My for loop isn't working
Because you are constantly overwriting the value assigned to Co_By(img_line_B,2) with a new value because all of this is inside ...

9 years ago | 1

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Exponential Function of Quaternions - quatexp -- error using scalar quaternions?
This is a bug in the quatexp function. E.g., >> q = [2 0 0 0;2 2*eps 0 0] q = 2.0000 0 0 ...

9 years ago | 1

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Is it possible to declare the matrix is symmetric in advance before multiplication?
No you cannot declare this explicitly. However, in some cases MATLAB will detect that there is a symmetric multiply and call sy...

9 years ago | 1

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Answered
How to define an array with multiple columns for each parameter in a for loop?
At each iteration, the array sub-section indexing would be: array(:,n*20-19:n*20)

9 years ago | 0

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Answered
How to change sign in a cell?
respPreStore = cellfun(@uminus,respPreStore,'uni',false);

9 years ago | 0

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Answered
How can I store function_handle objects in MEX code?
Not sure I follow everything that is going on with your code, but here are my observations: self.setMessageHand...

9 years ago | 2

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Answered
"nchoosek" function for a matrix whose all elements are 0 or 1
E.g., using a loop: f = find(A); n = numel(f); result = repmat(A,n,1); for k=1:n result(k,f(k)) = 0; end...

9 years ago | 1

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Answered
Error using mex (line 206) Unable to complete successfully.
You need to visit the link shown above, and install one of the supported compilers that is listed there.

9 years ago | 0

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Whats wrong in those equations?
Use element-wise operators (beginning with a dot) instead of matrix operators. E.g., y1=(0.02049/0.4)*x; y2=(0.59*60./(1...

9 years ago | 0

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Answered
a mex file in matlab program
To compile the mex routine, first place it in a working directory on the MATLAB path. Then make that your default directory and ...

9 years ago | 0

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Answered
how can i complement a DNA matrix using a binary vector?
Not quite sure I fully understand, but maybe something like this? mask = mod(X,1) > 0.5; % logical indexes of the characte...

9 years ago | 2

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how can I do this in matlab?
E.g., replacing * with element-wise multiply .* and / with element-wise divide ./ you get (assuming I got your parentheses corre...

9 years ago | 0

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Answered
return to previous step
Do you mean something like this? % Step A while( true ) % Step B % Step C % Step D if( condi...

9 years ago | 2

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Answered
using sprintf for floating point numbers
You don't have a semi-colon after this line: optEnergyCostString=sprintf('%g',optEnergyCost) so this result gets display...

9 years ago | 0

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Problem with straightforward problem - Can you help?
Use parentheses to separate your || operations from your && operations as necessary. E.g., this line if A=='1' && B...

9 years ago | 0

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How to invert 3D matrices?
Step 1) Get your 2D matrix pages into the 1st two dimensions. This makes each 2D page contiguous in memory and is somewhat of a...

9 years ago | 1

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Answered
matrix multiplication using bsxfun(@times,a,b)
Not sure if this is the operation you really want from your description: a = 6x7 matrix b = 7x3 matrix c = a * b; % ...

9 years ago | 0

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problem with loop while
You never change the value of freq_nat(2,2) inside your while loop, so if the while condition is true at the start of the loop, ...

9 years ago | 0

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Subscripting into an mxArray is not supported for code generation - I think it's the colon that's the issue
What happens if you use explicit indexes? V(1:n,1) = (1/beta)*w;

9 years ago | 0

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Why two equal numbers are not equal?
Already answered by others, but here is a detailed decimal conversion of what is going on with your particular example: >> ...

9 years ago | 1

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How can I extract the numbers which make up a specific number and insert them into an array?
If the number is an integer, e.g., x = your number result = num2str(x) - '0';

9 years ago | 1

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Answered
How to convert from a for loop to a while loop
Your loop doesn't work because the "continue" statement skips over the Index=Index+1 statement. You need to rewrite things _with...

9 years ago | 0

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Answered
how i can use ez plot with sin(x)/(1+x^2)
E.g., using default range -2pi to 2pi: fun = @(x) sin(x)./(1+x.^2) ezplot(fun)

9 years ago | 0

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Get a subset of a structure array in mex
Here is some sample code to create a subset of a struct array inside a mex routine. One key point is that there are no official ...

9 years ago | 1

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anybody can help me please..... how i can write this with plot ? x=0:1:5; y=-5x^3+3x^2-5;
Vectorize the operations using element-wise operations. E.g., x = 0:1:5; y = -5*x.^3 + 3*x.^2 - 5; % <-- Note the .^ in...

9 years ago | 0

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combination of two matrices
A = 160 x 12 matrix B = 160 x 12 matrix Ar = reshape(A',40*12,[]); Br = reshape(B',40*12,[]); result = reshape([Ar...

9 years ago | 1

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Answered
I need an elegant and fast way to get elements by single index in matrix
m = size(A,1); V = A((1:m)'+m*(I-1));

9 years ago | 1

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How can i flip specific bit of an binary array.
E.g., the bit in the (2,3) position: a(2,3) = ~a(2,3);

9 years ago | 1

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Answered
I am trying to sort three numbers without using inbuilt functions.What is wrong with the function?
Two of your branches do not set all three output variables. E.g., if p(1)<=p(2) if p(1)<=p(3) small...

9 years ago | 0

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Answered
Definite Integrals With Answer
For Part A, the instructor may want the answer in terms of x, not t. E.g. syms x disp(int(40-2*t,0,x)) % <-- Or disp(s...

9 years ago | 0

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