Answered
Subscript indices must either be real positive integers or logicals.
Use the debugger. Type this at the MATLAB command prompt: dbstop if error Then run your code. When the error occurs, th...

8 years ago | 0

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Answered
Day_diff calculate the difference in days between two peoples birthdays in 2015?
_"... Make sure to check that the input values are of the correct types and they represent valid dates ..."_ Based on the wor...

8 years ago | 0

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Answered
I would like to use forloop for Matrix rearrange..
Either this: x = your 1x500 variable result = reshape(x,100,5).'; or result = reshape(x,5,100); Depending on ...

8 years ago | 0

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Answered
Solving an Equation 5th degree
5th order polynomials cannot be solved symbolically in general. E.g., see this: <https://en.wikipedia.org/wiki/Algebraic_solu...

8 years ago | 0

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Wrong result in elipse equation
See this: <https://www.mathworks.com/matlabcentral/answers/57444-faq-why-is-0-3-0-2-0-1-not-equal-to-zero>

8 years ago | 0

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Answered
Is there a library for tracking the moon?
You could try these FEX submissions to get moon position: <https://www.mathworks.com/matlabcentral/fileexchange/56041-moon-po...

8 years ago | 0

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Subscript assignment dimension mismatch when calling function
Type the following at the MATLAB prompt dbstop if error Then run your code. When the error occurs, the code will pause a...

8 years ago | 1

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Answered
Multiple results for iteratively multiplying a matrix with a vector quickly
Note that as the power value gets higher, the numerical stability of successive matrix multiplies will degrade and you will not ...

8 years ago | 0

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Finding x such that 1 is eigenvalue
>> syms x >> det([1 2 3;3 x 4; 1 2 5]-eye(3)) ans = 5 - 3*x >> solve(ans) ans = 5/3 >> A = [1 2 3;3 5/3...

8 years ago | 0

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Missing symbol 'mxArrayClassIDName' in 'D:\matlab/bin/win64\libmx.dll' error?
mxIsA and mxArrayClassIDName used to be part of the C API library interface (they appeared as undecorated names). In R2014a thes...

8 years ago | 0

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In ODE solver how to use the time step of each iteration within the differential equation?
Based on your description, I would conclude that the deltat in the equation is simply the total amount of time that the mass flo...

8 years ago | 0

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Need help on assigning output arguments in C language
Defining functions inside of functions is an extension to the language. In your posted code, that means the functions compile OK...

8 years ago | 0

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Answered
How to plot 2nd order ode
Follow the 2nd Order van der Pol ODE example in the ode45 doc: <https://www.mathworks.com/help/matlab/ref/ode45.html?searchHi...

8 years ago | 0

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solving system of equations
1) Look at the examples here: <https://www.mathworks.com/help/matlab/ref/ode45.html?searchHighlight=ode45&s_tid=doc_srchtitle...

8 years ago | 0

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Answered
Matlab 2018a/Visual Studio 2017 linker failure, works in Matlab 2017b
One possible cause: If you compiled and ran the mex routine in R2017b, it could be that R2017b still has the stel.mexw64 file o...

8 years ago | 0

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How can i go from L1 to a low moon orbit?
E.g., the ODE solvers can use events: <https://www.mathworks.com/help/matlab/math/ode-event-location.html>

8 years ago | 0

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Creating C++ MEX Functions
Both VS Express and MinGW have C++ compilers. <https://www.mathworks.com/matlabcentral/fileexchange/52848-matlab-support-for-...

8 years ago | 0

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replace the 2nd and 3rd elements without the use of find
Hints: 1) Create a new variable to store a(b) <-- Assuming b is a logical vector here! 2) Use c to index into this variab...

8 years ago | 0

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What is wrong with my script?
Should this strcmp(alldata(k,3), 'SA{j}') be this strcmp(alldata(k,3), SA{j}) And should this strcmp(alldat...

8 years ago | 1

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Answered
Trying to do simple Monte Carlo simulation
Based on the wording of the assignment: To generate a normal distributed sample from the "5 +- .2 in": r = randn*(0.2/3)...

8 years ago | 1

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Answered
Matlab Calculates mod(2^1000,10^23) wrong
To expand on what Rik has posted ... IEEE double precision numbers only have about 16-17 equivalent decimal digits of precisi...

8 years ago | 0

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How to correct this error?"Subscripted assignment dimension mismatch."
ub(i,1) is a scalar element, but ones(n,1) is a vector if n>1. You can't assign a vector to a scalar element.

8 years ago | 0

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Answered
Direct cell {} indexing of class method output
Spot checking: Works in R2009a 32-bit and R2018a 64-bit, so I would presume it has always worked although I have not tested ever...

8 years ago | 1

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Answered
Access element of ND array specified by another array?
doc sub2ind

8 years ago | 0

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ODE45 for Second Order
Based on your description, I would have expected something more like this for the derivative: R = 2.5e-3; f = @(t,y) [y(...

8 years ago | 1

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XOR between two 3d arrays: array1>=250 xor array2>=170
You almost had the syntax correct. E.g., sum(xor(myarray1>=10.5,myarray2>=50),3)

8 years ago | 0

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Answered
Calculating all combinations of vector-element multiplication
I don't know how to avoid a loop of some sort for an arbitrary number of variables, even if it is hidden in the background. E.g....

8 years ago | 0

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Answered
making an array with element values equal to column position
result = repmat(1:N,M,1);

8 years ago | 0

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How to assign values in an identity matrix?
For this specific question, simple indexed assignment: I(1:2,end) = [2;4]; But what is your actual problem?

8 years ago | 0

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Answered
Precision in writing large numbers to file
See the 'precision' argument to dlmwrite.

8 years ago | 0

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