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How to I turn a fprintf column of values into a matrix
You can save all the values for plotting. E.g., xp = x0; yp = y; fp = f(x0); k = 1; for x = x0 : h : xn-h y = y + dy(x,y...

oltre 5 anni fa | 0

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Trying to go from Euler to Heun's Method
No, but you are close. You basically need to use the average of y' at the current state with y' at the Euler estimated next ste...

oltre 5 anni fa | 0

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Double sum - vector (matrix) solution
result = sum(C(:).*F(:)); or for later versions of MATLAB result = sum(C.*F,'all'); This all assumes that the actual indexing...

oltre 5 anni fa | 1

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Generate list of 2 digit combinations without repetition
Can't you just use the nchoosek(0:9,2) result and add in the known double results 00, 11, etc.?

oltre 5 anni fa | 0

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Program to convert decimal to binary and vice versa
See https://www.mathworks.com/help/matlab/ref/dec2bin.html and https://www.mathworks.com/help/matlab/ref/bin2dec.html

oltre 5 anni fa | 1

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plotting complex exponential function
E.g., maybe this is what you need y = 1*exp( -i20 *pi * t ) + 4*exp( i20 * pi * t ); plot(t,y); Although it is not clear what...

oltre 5 anni fa | 0

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Coding Crowell's Method for Orbiting Bodies
I don't have the patience to go through all of your dim and dimc logic. It would seem to be much easier to code and debug if yo...

oltre 5 anni fa | 0

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Plot the acceleration with ODE45
You find acceleration by taking the x solution from ode45( ) and feeding that back into your derivative function vdp1( ). Since...

oltre 5 anni fa | 0

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Multiplying by inverse of a matrix
You are essentially "dividing" by the X'*X quantity, so that is what needs to appear on the "bottom" of the slash. E.g., >> alp...

oltre 5 anni fa | 1

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"Matrix Dimensions must agree"
t is used to build r, but it is not the same length as phi.

oltre 5 anni fa | 1

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How to create a periodic function?
Not sure what you mean by "repeated at [2,10]". Maybe this: y = mod(x,2); ix = y > 1; y(ix) = 2 - y(ix);

oltre 5 anni fa | 0

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How do i use output of one function as input to the other ?
You can do this at the point where you are calling the function neg. E.g., z = neg(pos(x,y),q);

oltre 5 anni fa | 0

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Index in position 1 is invalid. Array indices must be positive integers or logical values.
When i=m in your loop you try to access kernel(m-m,n-j) which is kernel(0,m-j), and 0 is an invalid index. Similar problems wit...

oltre 5 anni fa | 0

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Solve a differential equation system with 4th order Runge-Kutta method with three equations
Not sure if you actually use t in your derivative functions, but you are missing that input from your j1, k1, and l1 code: ...

oltre 5 anni fa | 0

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sum of cubes question
This homework question is poorly written: It seems like the intent of the n is to use it as the upper limit of the for-loop, bu...

oltre 5 anni fa | 1

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Calling a function from another function
my_first_function1( ) doesn't return any value to the caller. To return a value you use this syntax: function absx = my_first_...

oltre 5 anni fa | 1

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Numerical integration of the differential equation of motion of the two body problem
Your biggest problem is that you don't carry enough states in your derivative function. Your ODE is a 3D 2nd order equation, so...

oltre 5 anni fa | 0

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How to swap multiple rows of a matrix at a time
A = your matrix A([1:63,142:202],:) = A([142:202,1:63],:);

oltre 5 anni fa | 0

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Probability of binary sequence with Monte Carlo
First point is that probability of stopping at n=3 is not 2/6, it is (3/4)*(2/6) because you have to include the probablility th...

oltre 5 anni fa | 1

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Problem at +/- 180 degrees in orientation estimation from IMU data
You can try the unwrap( ) function: https://www.mathworks.com/help/matlab/ref/unwrap.html

oltre 5 anni fa | 0

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Help with secant method
You might look here which even includes example code: https://en.wikipedia.org/wiki/Secant_method

oltre 5 anni fa | 0

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How do I add an integer to every or any nth row
A(k,:) is the k'th row of A A(:,k) is the k'th column of A A([k m p],:) is the sub-matrix formed from the k'th, m'th, and p'th...

oltre 5 anni fa | 1

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First and last occurrence of an element in an array
So the description of the problem doesn't say anything about consecutive values, so the code you have for that should be elimina...

oltre 5 anni fa | 0

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Parse error at ']'
Looks like you just need commas instead of periods. E.g., [r,i,v,dr,di,dv]

oltre 5 anni fa | 0

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Simple Blackjack Simulation in MATLAB
A few things ... Seems like you should have this: deck = repmat([1,2,3,4,5,6,7,8,9,10,10,10,10],1,8); % two decks worth of car...

oltre 5 anni fa | 1

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Can not convert USHORT MAX to ufix16_Sp01
If you have a slope scaling of 0.01 and a bias of 0, doesn't that mean the max value is 65535*0.01 = 655.35?

oltre 5 anni fa | 0

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Using ODE45 for coupled equations
General procedure: Define a variable, let's call it y to match the doc, that will be your state vector. Each element of y corr...

oltre 5 anni fa | 0

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please help with work
Use the input( ) function to get the user input. Use the optional 's' argument to get the input as a char string. I'm assuming...

oltre 5 anni fa | 0

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How to get Matlab Version at Mex Compilation Time?
My MATLAB version code works for me in R2020a: >> mex matlab_version_test.c Building with 'Microsoft Visual C++ 2015 (C)'. ME...

oltre 5 anni fa | 0

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Is there a way to use symbolic functions in ode45
Convert it to a function handle so that it can be used with numeric inputs. E.g., >> syms x >> f(x) = sqrt(x) + 2 f(x) = x^...

oltre 5 anni fa | 1

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