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How to create a vector of symbolic variables with specific labeling
The simple direct way seems easiest. v = sym('v',[1 29]); v = v([1 2 3 5 7 9 10 12 18 29])

5 years ago | 0

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Unable to plot exponential graphs properly
What do you reasonably expect to happen? t varies over the interval -10 and 400. What is exp(-10)? If you don't know, then try ...

5 years ago | 0

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Plot graph of polynomials
That is not a polynomial. You have a sqrt root in there. And an absolute value. So learn how to use functions like abs, and sqr...

5 years ago | 1

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Answered
Can someone explain to me why I'm getting "Not enough input arguments" in line 2
For the simple reason that you named a function named size. Don't do this. Type this at the command line: which size -all If i...

5 years ago | 0

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Solving a system of equations with arbitrary Parameter value
Look carefullly at what is returned. solution = solve(eqn_final, variable_final, "ReturnConditions", true); solution solution...

5 years ago | 0

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why PSI values are diffrent when nlmefit using ode45 solver compared to when it uses analytical solution?
There can sometimes be problems when you try to apply a nonlinear estimation scheme on top of an ODE solver. The nonlinear fitti...

5 years ago | 0

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I don't know how to call my function
What language are you using here? Possibly not MATLAB. :) s = s + L*(i)^2; Do you think that squares the number i, and then mu...

5 years ago | 0

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How efficient is it to use (end+1) to add a value to an array?
Increasing the size of an array incrementally is a TERRIBLE thing to do. WHY? Every time you add a new element to the end of t...

5 years ago | 1

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How to use ~= operator as constraint function?
For which solver? This is a 1-variable problem. If you want help, it does help if you explain more than you have done. Note tha...

5 years ago | 1

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solve efficiently sparse large linear system of equations
The fact is, a 3kx3k system is not that slow to solve. So unless you are doing this solve many thousands of times, keeping it sp...

5 years ago | 0

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Matlab envelope function help
Seems pretty easy. Read the help, and look at the examples. Envelope is part of the signal processing toolbox. t = linspace(0,5...

5 years ago | 0

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Answered
Solving equations for Variable/Variable
No reason you cannot do this: syms A B C D E eqn = (A*B*C)/E == D; syms CoverD solve(subs(eqn,C,CoverD*D),CoverD)

5 years ago | 0

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Answered
Am I to understand that every function in matlab should be its own file?
Like SOME languages. Perhaps the ones you know. But certainly not all other languages. In general, yes, it is not unreasonable ...

5 years ago | 1

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Find Image SVD without using SVD command
Too late for an answer to the question posed, but since the question is getting comments asking for more help, I'll post an answ...

5 years ago | 2

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How to find the closed form solution of the natural and forced response of 2sin(3t) - 4x with x(0) = 0
Why do you think it is not correct? Would dsolve lie? That dsolve code must be pretty darn tricky. In fact, you have not used d...

5 years ago | 1

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Answered
parallel computing in Genetic algorithm
Whenever I see someone say they need to use parallel computing to make their code run faster, I wonder if the real problem is th...

5 years ago | 0

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Solving Linear equation using LU Factorization and COLAMD
First, making a 100x100 matrix sparse is silly. Flat out, silly. The amount of time needed to solve that system is tiny, even as...

5 years ago | 0

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How do i write the function for the taylor polynomial of cos(x) using for loops and no anonymous function
We can see how well it works. Your code is below. Now, let me test it out, in a symbolic form. syms X P8 = taylor_cos(X,4) I...

5 years ago | 1

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Why is 0.3 - 0.2 - 0.1 not equal to zero?
Let me add my take on the problem. Suppose we try to represent these numbers in a binary form? That is, represent 1/10 = 0.1 i...

5 years ago | 4

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How to divide the interval of any distribution in N equal parts based on its area?
As long as you have the cumulative distribution, and most importantly, an inverse for the cumulative, this is all you need. For ...

5 years ago | 0

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Answered
Curve fitting to atan function not working
phi_A=[-3.228;1.574;-0.8063;0.02548;1.904;2.87;1.853;-1.824;3.929]; phi_B=[-3.259;-1.466;-3.859;-3.035;-1.18;2.857;1.851;-1.811...

5 years ago | 0

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Answered
Why doesn't my script work? It comes back with Error: File: equTriPrismSurfArea.m Line: 6 Column: 1 This statement is not inside any function.
READ THE CODE YOU WROTE. function [SA]=equTriPrismSurfArea(s,h) SA=((sqrt(3)/2)*(s^2))+(3*s*h); end s = [1 2 3 4 5]; ...

5 years ago | 0

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Answered
symbolic calculation for series
But you defined U as a double precision array! See the difference. V = zeros(5) Note that zeros(5) creates a 5x5 array. If you...

5 years ago | 1

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What is a symbolic expression (syms) and how do I use this when doing differentiation in matlab?
No. You misunderstand what diff does, and why diff is used there. diff, when applied to a numeric vector, forms the difference ...

5 years ago | 0

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How to plot a multivariable function with constraints
Can you solve for y, as a function of k, given the constraint? (YES.) If so, then do you really have a TWO variable problem? (N...

5 years ago | 1

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How to remove outliers and smooth the complex signals?
Is it valid to work with the real and imaginary parts separately? Possibly, though you know the data better than we do. What cau...

5 years ago | 0

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Why do I receive Index exceeds the number of array elements (1)?
You would be best served to learn to use the debugger. But I can see what happens. At the first iteration, i = 1. And all of yo...

5 years ago | 2

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How to write following equation with "dsolve" command?
Oh well. My fault, as i saw this question posted just before I went to bed last night. No rest for the weary. :) But we can at l...

5 years ago | 1

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how to evaluate integral for given input function ?
No, you don't want to fit a polynomial to that vector. Polynomials are just bad news for anything. After seeing the your pictur...

5 years ago | 1

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Answered
What determines computation speed in MatLab?
What determines computation speed? A huge number of things. Try running bench on your computer. It looks at a many computations...

5 years ago | 1

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