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I don't know Why my mex function associated with a Fortran 77 does not work. Can anybody help me?
1) "size" is the name of an intrinsic Fortran function that you shouldn't shadow. Pick a different name for your variable. 2)...

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need to print a matrix with a string
Assuming there are three grades in the quiz field, maybe this will work for you fprintf('%s %d %d %d\n',student(i).lastn...

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datenum to UTC?
Are you just looking for how to convert from the former to the latter? E.g., s = '10-Oct-2013 15:59:00'; unix_m4 = (date...

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How can I delete row based on the value of row (i) and row (i+1)
I _think_ this is what you are asking for (i.e., delete all rows that have equal neighbors in column 10): X = your matrix ...

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how to transfer data from MATLAB to c++ using MEX
Here is some example code for you. It is written as a mex routine but you should be able to adapt the functions to your Engine a...

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How do I create a column vector of random numbers with interval [-0.1;0.1], with N elements?
N = whatever de = whatever result = rand(N,1)*(2*de) - de;

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Error out of memory
Type the following at the command line: dbstop if error Then run your code. When the error occurs, the code will pause w...

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Simple Math With Complex Arrays
So, MATLAB has functions i and j defined as the imaginary sqrt(-1) values. I notice that you are using i and j as indexing. This...

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output argument not assigned
Based on what you have posted, it appears var has more than 3 dimensions, so you aren't getting into your code above.

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My professor is driving me crazy.
Maybe he wants the results presented in columns? tmax = 50; step = 5; t = (0:step:tmax)'; % make it a column X = [...

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What is the solution of this problem? this is array 13*13
It means the pieces do not form a 13x13 matrix. That is what you need to fix.

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Simulating gravity, forces seem to be miscalculated (need help)
I don't have the time to step through your code, but I don't see where you set the sign of F as an attracting force. Maybe all y...

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How to add uniform noise with given range
lower_bound = something upper_bound = something n = number of samples u = lower_bound + rand(1,n)*(upper_bound-lower_...

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representation of positive and negative number to binary 1 and 0 in matlab
result = volts > 0; This will give you a logical result. If you need the result to be double, then simply result = dou...

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Matlab if statements in physics
You can easily run the code to see that it clips the values outside of [-1,1] so that they stay in this range. But it appears th...

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inv matrix command error
Normally the inv is applied to the left hand side coefficients, since people usually write the "A" matrix on the left and the "b...

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Log equation log(x) not plotting correctly
Since you are trying to graph the inverse of the functions, you should be switching the domains as well when you generate the po...

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How do I implement cosd in simulink
You could use a MATLAB Function block, or perhaps scale the input prior to going into a sin block.

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Orbit by euler's method
I don't see anything obviously wrong with your code. So other possibilities to consider are: - The step size is too large for...

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Use a "while" loop to create the vector x = [4 16 28 40]. Note the constant increment of 12.How can i put the ic values in x.Help please
You need something inside the while loop that sets the value of the x elements. E.g., k = 1; while ic < 40 x(k) = ...

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error in Euler method
You need to recalculate the derivatives at _each_ time step. So all of the stuff that goes into calculating dX needs to be insid...

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Unusual slowdown using sum.
Are you pre-allocating Grandarray?

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Trying to develop a program to implement Euler's Method for a second order system
Here's a start: Create a file called deriv.m in your working directory. Since you will have two first order equations, define...

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MATLAB Coder: Matrix-Scalar-Multiplication slower in generated code?
I'm only seeing about a 5% difference in timing when comparing the BLAS dscal function call to an explicit loop in my R2017b Win...

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How to solve a first order ODE system with coupled equations
If you have these dependencies among the dy4/dt, dy5/dt, and dy6/dt terms, then you need to first solve for them uniquely. Just ...

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Is there any way to display a row of a character vector?
Not sure if this is what you are asking: C = your 407 x 36 character matrix r = your row number result = C(r,:); % ro...

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Problem with a function.
You need to pass s into your perimeter function: p = perimeter(s);

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How to output a mexFunction input without copy
If you are returning a modified variable, then you basically have three choices: 1) Do it the way you were previously doing i...

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How do I convert this into a 2d matrix of 50x50 in Matlab?
_"... I copied the values from Matlab's command window directly …"_ That means it is a sparse matrix based on the format of ...

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Index exceeds array bounds help - Fibonacci Series
_"... For this reason, since at the end we only need the (N)th and (N-1)th terms, we can delete all the other ones as the loop g...

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