897 total contributions since 2017

Knowledge means knowing where it is written...

Interested in:

- Optimization

- Mathematical Modelling

- Improvement of my programming skills

Answered

problem finding the coordinates of point in stainer tree problem by brute force

your if is ending 3 lines to early. No matter what happens, you get a = x(end) and b = y(end). the m you get is the last that fu...

problem finding the coordinates of point in stainer tree problem by brute force

your if is ending 3 lines to early. No matter what happens, you get a = x(end) and b = y(end). the m you get is the last that fu...

6 hours ago | 1

Answered

GA with integer constraints

The genius answer is given in the documentation of ga: https://de.mathworks.com/help/gads/mixed-integer-optimization.html#bs1ci...

GA with integer constraints

The genius answer is given in the documentation of ga: https://de.mathworks.com/help/gads/mixed-integer-optimization.html#bs1ci...

21 hours ago | 0

Answered

Calculate Area of 3D points

If all points on a plane are in 3D space, you could create a polyshape object by using <https://de.mathworks.com/help/matlab/ref...

Calculate Area of 3D points

If all points on a plane are in 3D space, you could create a polyshape object by using <https://de.mathworks.com/help/matlab/ref...

2 days ago | 0

Answered

How will I reduce the time it takes to calculate data?

<https://de.mathworks.com/help/matlab/performance-and-memory.html>

How will I reduce the time it takes to calculate data?

<https://de.mathworks.com/help/matlab/performance-and-memory.html>

2 days ago | 0

Answered

How to solve delayed reaction diffusion equations by Mathlab?

<https://de.mathworks.com/help/matlab/delay-differential-equations.html?s_tid=CRUX_lftnav>

How to solve delayed reaction diffusion equations by Mathlab?

<https://de.mathworks.com/help/matlab/delay-differential-equations.html?s_tid=CRUX_lftnav>

2 days ago | 0

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Answered

what functionalDerivative returns is a 1*1 symfun, not a vector

syms u(x) v(x) H = u^2*diff(v,x)+v*diff(u,x,x); D(1) = functionalDerivative(H,u) D(2) = functionalDerivative(H,v)

what functionalDerivative returns is a 1*1 symfun, not a vector

syms u(x) v(x) H = u^2*diff(v,x)+v*diff(u,x,x); D(1) = functionalDerivative(H,u) D(2) = functionalDerivative(H,v)

2 days ago | 0

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Answered

Clustering data into specific range

check out the data type <https://de.mathworks.com/help/matlab/ref/categorical.html categorical>

Clustering data into specific range

check out the data type <https://de.mathworks.com/help/matlab/ref/categorical.html categorical>

2 days ago | 0

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Answered

How to define binary variables in an optimization problem?

usually you set them to be integers and bound them between 0 and 1

How to define binary variables in an optimization problem?

usually you set them to be integers and bound them between 0 and 1

2 days ago | 0

Answered

How can I solve a system of ODEs with boundary conditions

<https://de.mathworks.com/help/matlab/boundary-value-problems.html?s_tid=CRUX_lftnav>

How can I solve a system of ODEs with boundary conditions

<https://de.mathworks.com/help/matlab/boundary-value-problems.html?s_tid=CRUX_lftnav>

3 days ago | 0

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Answered

How do i merge graphs in bvp4c format ?

hold on for k = 1:4; Ha = k; init = bvpinit(linspace(-1,1,20),[0 0]); sol=bvp4c(@(x,y)rhs_bvp(x,y,Ha),@bc_bvp,init); x = ...

How do i merge graphs in bvp4c format ?

hold on for k = 1:4; Ha = k; init = bvpinit(linspace(-1,1,20),[0 0]); sol=bvp4c(@(x,y)rhs_bvp(x,y,Ha),@bc_bvp,init); x = ...

3 days ago | 0

Answered

I have a multi dimension matrix (:,:,:) that I need to export to excel

If it would be acceptable to have all matrices in one excel sheet, you could use: A = (reshape(your_matrix,5,[],1))'

I have a multi dimension matrix (:,:,:) that I need to export to excel

If it would be acceptable to have all matrices in one excel sheet, you could use: A = (reshape(your_matrix,5,[],1))'

3 days ago | 0

Answered

I have 100 data scattered across 100 X 100 size plot. I need to partition the plot into four sub-sections across the center. Can anyone help me.

starting from R2018b you can use <https://de.mathworks.com/help/matlab/ref/xline.html xline> and <https://de.mathworks.com/help/...

I have 100 data scattered across 100 X 100 size plot. I need to partition the plot into four sub-sections across the center. Can anyone help me.

starting from R2018b you can use <https://de.mathworks.com/help/matlab/ref/xline.html xline> and <https://de.mathworks.com/help/...

3 days ago | 0

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Answered

how to make loop in

%km = 72x1 (matrix) x = zeros(25,1); % preallocate for x=1:25 cx(x) = Km(x,1)+Km(x+1,1)+Km(x+6,1)+Km(x+7,1)+Km(x+36,1)+Km(x...

how to make loop in

%km = 72x1 (matrix) x = zeros(25,1); % preallocate for x=1:25 cx(x) = Km(x,1)+Km(x+1,1)+Km(x+6,1)+Km(x+7,1)+Km(x+36,1)+Km(x...

3 days ago | 0

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Answered

Are the operators like " .* ", " ./ " won't work in simulink?

It is a parameter: <https://de.mathworks.com/help/simulink/slref/product.html#brofebg> <https://de.mathworks.com/help/sim...

Are the operators like " .* ", " ./ " won't work in simulink?

It is a parameter: <https://de.mathworks.com/help/simulink/slref/product.html#brofebg> <https://de.mathworks.com/help/sim...

3 days ago | 0

| accepted

Answered

solving two symbolic equations simultaneously

syms x y a b eq1=a==x+y; eq2=b==x-y; [xsol,ysol]=solve([eq1 eq2],[x y]) sol.x sol.y or: syms x y a b eq1=a==x+y;...

solving two symbolic equations simultaneously

syms x y a b eq1=a==x+y; eq2=b==x-y; [xsol,ysol]=solve([eq1 eq2],[x y]) sol.x sol.y or: syms x y a b eq1=a==x+y;...

4 days ago | 1

| accepted

Answered

Function definitions are not permitted in this context

Add the missing end after line 148 (from your outer while loop) to get rid of this error. This end is missing, so Matlab...

Function definitions are not permitted in this context

Add the missing end after line 148 (from your outer while loop) to get rid of this error. This end is missing, so Matlab...

4 days ago | 0

Answered

Write a function called freezing that takes a vector of numbers that correspond to daily low temperatures in Fahrenheit. Return numfreeze, the number of days with sub freezing temperatures (that is, lower than 32 F) without using loops. Here is an ex

function numfreeze = freezing (n) n1 = n(n<32) numfreeze = numel(n1) end Dont overwrite n - it is an input argument

Write a function called freezing that takes a vector of numbers that correspond to daily low temperatures in Fahrenheit. Return numfreeze, the number of days with sub freezing temperatures (that is, lower than 32 F) without using loops. Here is an ex

function numfreeze = freezing (n) n1 = n(n<32) numfreeze = numel(n1) end Dont overwrite n - it is an input argument

5 days ago | 0

Answered

how to solve these equations

for only real solutions: syms a b c d real eq(1) = a^2+b*c==-1; eq(2) = a*b+b*d==1; eq(3) = a*c+c*d==-1; eq(4) = d^2+b*...

how to solve these equations

for only real solutions: syms a b c d real eq(1) = a^2+b*c==-1; eq(2) = a*b+b*d==1; eq(3) = a*c+c*d==-1; eq(4) = d^2+b*...

6 days ago | 0

Answered

how to get combination of elements in a matrix in pair order

A=[3 5 6 7 8]; b = nchoosek(A,2) b = 3 5 3 6 3 7 3 8 5 6 ...

how to get combination of elements in a matrix in pair order

A=[3 5 6 7 8]; b = nchoosek(A,2) b = 3 5 3 6 3 7 3 8 5 6 ...

6 days ago | 0

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Answered

Can I using Genetic Algorithm to solve a integer quadratic problem?

<https://de.mathworks.com/help/gads/solving-a-mixed-integer-engineering-design-problem-using-the-genetic-algorithm.html>

Can I using Genetic Algorithm to solve a integer quadratic problem?

<https://de.mathworks.com/help/gads/solving-a-mixed-integer-engineering-design-problem-using-the-genetic-algorithm.html>

8 days ago | 0

Answered

how to convert .mat file to .m file in matlab R2019a version

You can not convert *.mat to *.m files. The *.mat format saves variables from workspace and the *.m file format saves Matlab cod...

how to convert .mat file to .m file in matlab R2019a version

You can not convert *.mat to *.m files. The *.mat format saves variables from workspace and the *.m file format saves Matlab cod...

9 days ago | 0

Answered

Rearranging an equation containing the linsolve function

Residuals = CoefficientsMatrix*A

Rearranging an equation containing the linsolve function

Residuals = CoefficientsMatrix*A

9 days ago | 0

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Answered

Solve Function - Having Difficulties

syms x xsol = solve(str2sym('x+4==2'),x)

Solve Function - Having Difficulties

syms x xsol = solve(str2sym('x+4==2'),x)

13 days ago | 1

| accepted

Answered

error using sym/subs with logical operation

1 You only substitute x1 - you have to substitute them both. Try: syms x1 x2 aa= x1 == 0 & x2 == 0 aa = subs(aa,[x1 x2], [0....

error using sym/subs with logical operation

1 You only substitute x1 - you have to substitute them both. Try: syms x1 x2 aa= x1 == 0 & x2 == 0 aa = subs(aa,[x1 x2], [0....

13 days ago | 1

| accepted

Answered

how i can use roots in matlab

RHS has to be zero, then put the coefficients in descending order into a vector - read here: https://de.mathworks.com/help/matl...

how i can use roots in matlab

RHS has to be zero, then put the coefficients in descending order into a vector - read here: https://de.mathworks.com/help/matl...

15 days ago | 0

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Answered

Evaluating a symbolic expression numerically without invoking the syms command

Save them as function handle in your .mat file. This allows you to use them numerical. <https://de.mathworks.com/help/symboli...

Evaluating a symbolic expression numerically without invoking the syms command

Save them as function handle in your .mat file. This allows you to use them numerical. <https://de.mathworks.com/help/symboli...

16 days ago | 0

| accepted

Answered

Can genetic algorithm be nested?

It should be possible in one single call of ga. In this case nvars would be 2*numel(q) and you have to set the correct bounds an...

Can genetic algorithm be nested?

It should be possible in one single call of ga. In this case nvars would be 2*numel(q) and you have to set the correct bounds an...

19 days ago | 0

Answered

How can I determine the indices and length of consecutive non-NaN values in an array?

1. FInd the indexes: B = find(isnan(A)) 2. To find consecutive blocks you could use the diff function on a logical array: C =...

How can I determine the indices and length of consecutive non-NaN values in an array?

1. FInd the indexes: B = find(isnan(A)) 2. To find consecutive blocks you could use the diff function on a logical array: C =...

19 days ago | 1

| accepted