Answered
Derivative of a function with constants
syms x a b c f = x*e^x*(a*x^2+b*x+c); df = diff(f,x)

12 días ago | 0

Answered
I want to find the five unknown of a system of five nonlinear equations. Thank you !
function main x0 = rand(5,1); x = fsolve(@fun,x0) end function res = fun(x) k1 = x(1); k2 = x(2); k3 = x(3); k4 = x(4); ...

12 días ago | 0

Answered
Errors while trying to setup equation for root finding.
function main a0 = 1; a = fzero(@fun,a0) end function res = fun(a) z_pdo = ...; k_pdo = ...; z_water = ...; ...

12 días ago | 0

Answered
Why my graph is not the same as paper!!
clear all rlength =10; %meter dx = 0.0001; Numdata = rlength/dx; %constant value Cpf=0.707; %kcal/kg.K Cpg=0.719; %kcal/kg...

12 días ago | 1

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Answered
If I have 512 matrices (entries of each matrix is looping modulo 2), how the multiplication syntax for those 512*512 matrices ?
m = 9; justRows = dec2bin(0:2^m-1)-'0'; for i = 1:size(justRows,1) A = reshape(justRows(i,:),[3,3]); M{i} = A; end

13 días ago | 0

Answered
solve four variables 1111
function main A = input('1,2;3,5'); B = input('8,-1;3,7'); C = input('2,6;8,4'); a1=A(1,1); a2=A(1,2); a3=A...

13 días ago | 1

Answered
using mat2cell
C = mat2cell(M.',ones(1,10)); % M is your 1001x10 numerical matrix

13 días ago | 0

Answered
using runge kutta RK2 on matlab
function main f = @(x,y) 5-50*y; a = 0; b = 1; n = 100; h = (b-a)/n; y(1) = 0; i = 0; for x= a:h:b-h ...

14 días ago | 0

Answered
How do I loop a fucntion over matrix columns and store the results in a column?
If R is your matrix: [m,n] = size(R); H = zeros(n,1); for i = 1:n r = R(:,i); H(i) = dfaedit(r ); end

14 días ago | 0

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Answered
Script matlab calculate vectors
syms a b c A = [a b c]; B = [-2 1 -4]; C = [1 3 2]; result = [5*a+6 3*b-2 -4*c+1]; AB = cross(A,B); AC = cross(A,C); S = ...

14 días ago | 0

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Answered
Using temperature and pressure data to estimate antoine coefficients for glycerol
antoine = @(b,T) 10.^( b(1) + b(2)./(T+b(3))); beta0 = [3.93737,1411.531,-200.566]; beta = nlinfit(T,p,antoine,beta0)

14 días ago | 1

Answered
Find the value of x when the first derivative is equal to 0
x = -pi/2:0.01:pi/2; y = cos(x); dydx = diff(y)./diff(x); [~,idx] = min(dydx.^2); xmin = (x(idx+1)+x(idx))/2 xmin is the po...

15 días ago | 0

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Answered
How to calculate numerical integral with more than 3 variables in Matlab? ( > integral3 )
Which method is best-suited depends on the specific problem. Maybe https://de.mathworks.com/matlabcentral/fileexchange/47919-i...

15 días ago | 0

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Answered
MATLAB 2010 code not working in MATLAB2012a ?
The filename must be "testingfile.m" not "TestingFile.m" Or your function must be renamed in function [z,w] = TestingFi...

15 días ago | 1

Answered
Function inside a for loop
An array of function handles is not possible. Instead, you should define s41_0 = @(a,T) a.*s_CO2(T) and evaluate it as val41...

15 días ago | 1

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How can I reshape single column vector list into equally sized matrix columns
s = mod(26599,512); n = 26599 - s; m = n/512; R = horzcat(reshape(sample_test(1:n),512,m),vertcat(sample_test(n+1:end),NaN(51...

15 días ago | 0

Answered
Solving a discrete logarithm problem returns a 0x1 sym or Unable to find explicit solution
Brute force: x = 0:24; y = uint64(6.^x); d = mod(y,11); x = x(d==2)

15 días ago | 0

Answered
Why do I receive this error when using cumsum: "Invalid data type. First input argument must be numeric or logical." ?
Try this: function main file_name = 'sample_test.txt'; H = dfaedit(file_name,1,1,1) end function [H]=dfaedit(file_...

16 días ago | 0

Answered
How can you change the bounds used by a solver with each iteration?
Use "fmincon" instead of "lsqnonlin" and change the bounds in "nonlcon".

16 días ago | 0

Answered
How to plot the graph of y=ax+b?
x=0:0.1:50; y=53.5*x-1354.5; plot(x,y)

16 días ago | 0

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Answered
Storing function outputs to an array so they can be plotted
A = 1:20; H_l = 2*(A+1); Sig_Lambda = 1*10^-9; I = A.*H_l*Sig_Lambda; plot(Lambda,I) works if Lambda is a sorted 1x20 ve...

16 días ago | 1

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Answered
how can i make a general matrix?
function main L = [1 2 0.1 0.2 0.02; ... 1 4 0.05 0.2 0.02; ... 1 5 0.08 0.3 0.03; ... 2 3 0.05 0.25 0.03; ... ...

16 días ago | 1

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Answered
Remove Zeros Matrix on 3D Matrix
function main val = rand(2,3,4) val(:,:,3) = [] end

17 días ago | 0

Answered
Plot the Poisson CDF with the Standard Normal Distribution CDF
I suspect the graphics shows that the arithmetic mean of normalized independent Poisson random variables converges in distributi...

17 días ago | 0

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how can i change the dimension of the matrix?
You must first decide where you want element (i,j,k) of the old matrix be placed in the new matrix. But usually MATLAB's "resha...

17 días ago | 0

Answered
how to calculate a difference of function with any parameter
function main h = 1e-6; xleft = -pi; xright = pi; n = 200; dx = (xright-xleft)/n; x = xleft:dx:xright; chan...

17 días ago | 0

Answered
the projected distances between the line and edge A
You will have to check for correctness: % Project p1 on plane ABC (gives point p1-proj) Mat = [(B-A)*(B-A).' , (B-A)*(C-A).';(...

19 días ago | 0

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Answered
Coding a system of differential equations
Numerically solving the original system will make difficulties because of the singularity at t=0 for y. So let's first rewrite ...

19 días ago | 0

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Answered
Product of vector elements where the vector has a large size
Product_V = exp(sum(log(V(1,:)))/numel(V))

19 días ago | 0

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