Risposto
Calculating the height of a liquid in a sphere using secant method
You need to use a function that is 0 at the h you are looking for. So you need that 30 in your function handle. E.g., func = @(...

oltre 5 anni fa | 0

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Not enough input arguments
You need to call the function with the N input you just got from the user. E.g., disp(quiz6_func1(x,N))

oltre 5 anni fa | 1

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Risposto
ode45 function array error
You have tm(1) = 0, so using tm(1) as an index is invalid: tm=[0 30 etc... : for i=1:length(tm) : Ss_in(tm(i):end)...

oltre 5 anni fa | 0

Risposto
Is FORMAT DEBUG still any useful?
Strange behavior and probably deserves a bug report. E.g., R2019a: >> x = 1; >> y = x; >> x = x + 1; >> format debug >> y...

oltre 5 anni fa | 1

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Risposto
Precision (decimal digits) are very low and digits(32) does not help.
This is likely just a display issue and you don't need the Symbolic Toolbox. MATLAB does regular calculations in full double pr...

oltre 5 anni fa | 0

Risposto
Consecutive subtraction of the entries of a vector
If A is a row vector: B = [A(1) diff(A)]; If A is a column vector: B = [A(1);diff(A)];

oltre 5 anni fa | 0

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Risposto
generate random number with total sum is 10
Not sure from your wording if you want the row sums to be 1 or 10. If it is 1, then r = rand(6,1); r(:,2) = 1 - r(:,1); Modif...

oltre 5 anni fa | 0

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when does changing variable's value affects its structure address?
In addition to what Walter has written, I would point out that all of the rules for variable creation, assignment, and sharing h...

oltre 5 anni fa | 0

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Risposto
Replace the numbers in an array
A(~isnan(A)) = B;

oltre 5 anni fa | 1

Risposto
Vector ODE using forward Euler method
Also your main code should look something like this: g = 9.8; mu = 0.5; [t,y]=ode45(@(t,y)rhs_1(t,y,g,mu),[0 100],[0.1; 0]); ...

oltre 5 anni fa | 1

Risposto
unique function return value of duplicate vector entry
Why can't you just use ind1 and ind2? E.g., V1_1 = V1_1(ind1); V2_1 = V2_1(ind1); V1_2 = V1_2(ind2); V2_2 = V2_2(ind2);

quasi 6 anni fa | 0

Risposto
Insignificant modification of code leads to NaN
Think about what is happening with this loop: for i = 1:num_iterates x = A*x; R(:,i) = x/norm(x); %%%% Problem Line %...

quasi 6 anni fa | 1

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Risposto
Skip instance of a loop with error
Something like this: try fn = x+y+z; %The function is just a representation. I am actually performing a Fi...

quasi 6 anni fa | 0

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Risposto
Performance of applications that are developed in MATLAB versus C++/C
Any such comparison will depend on exactly what computations are in question. A general comparison of languages probably isn't ...

quasi 6 anni fa | 4

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Numerical Integration by Matlab
Hint: You might look here: https://en.wikipedia.org/wiki/Normal_distribution Knowing that the integral of the Normal density f...

quasi 6 anni fa | 0

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Does MEX compiler (and the associated shared files) automatically ship with all MATLAB distributions of any license type?
Mex routines are not guaranteed to be compatible between different versions of MATLAB, for the very dependency reasons you alrea...

quasi 6 anni fa | 1

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Risposto
function call returns "index (1.2): subscripts must be either integers 1 to (2^63)-1"
You are missing a multiply operator. There is no implied multiplication in MATLAB with the 2( combination. E.g., u_1 = @(y) ...

quasi 6 anni fa | 0

Risposto
Mex, how to copy an array to output
See the solutions I posted here: https://www.mathworks.com/matlabcentral/answers/702682-with-mxmalloc-and-mxsetdoubles-mex-func...

quasi 6 anni fa | 0

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Risposto
With mxMalloc() and mxSetDoubles(), mex function crash matlab
You have memory leaks in your current code. E.g., tmpResult = mxMalloc(numRows*numRows*sizeof(*tmpResult)); // this memory ...

quasi 6 anni fa | 2

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Risposto
hi I am trying to use this code to solve RK4 equation and I keep receiving this error . what should I do?
Your implementation has several errors: Looks like you are creating i as a vector and then using that for indexing in A(i) You...

quasi 6 anni fa | 0

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Risposto
Filling in multidimensional array efficiently
Something like this maybe? k = 1; % your loop b = r x 1800 matrix f = whatever ch = whatever r = size(b,1)...

quasi 6 anni fa | 0

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extract out values out of loop
Make them arrays and assign to the elements. E.g., for i= 1: length(Hi) [XYZ(:,i),H(i),D(i),I(i),F(i)] = wrldmagm(Hi(i),La...

quasi 6 anni fa | 1

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Risposto
Projectile motion with drag. My problem is in the loop as the number of elements are not equal apparently on the left and right. Id appreciate detailed input ive been lost on this for a couple of days now
This makes AccDrag a vector: AccDrag(1,:) = [AccDragX(1) AccDragY(1) 0] So here you have a vector on the right hand side and a...

quasi 6 anni fa | 0

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Risposto
calling another matrix in a matrix
Don't do this! Creating numbered named variables in your code like yakit_1, yakit_2, etc. leads to downstream coding problems a...

quasi 6 anni fa | 0

Risposto
Newton Raphson Method in a for loop
You don't have the Newton-Raphson method coded correctly. You need to update the x value you use for the delta within the loop ...

quasi 6 anni fa | 0

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How to use ode45 to solve a system of two differential equation?
If you don't have the Symbolic Toolbox, here is the procedure: 1) Write your equations in matrix form: F*qdotdot + G*qdot + H*...

quasi 6 anni fa | 0

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Multiplication of large matrices
Do NOT transpose your matrix explicitly before the multiply. That will only cause a deep copy, double the memory footprint, and...

quasi 6 anni fa | 1

Risposto
[Matlab Grader] How to check if the matrix has upper triangular form?
This looks like a display issue. The numbers in the lower triangle are not exactly zero, they just display that way out to 4 dig...

quasi 6 anni fa | 0

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Risposto
Questions about how to plot a summation function with two variables
From the formula image, it appears you need fun( ) to create a matrix z where each element corresponds to the formula for a part...

quasi 6 anni fa | 0

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Risposto
How could I solve this system of ODEs?
For your case, simply start the run at time T and integrate backwards in time to t0. I.e, this is still an initial value proble...

quasi 6 anni fa | 1