903 total contributions since 2017

Knowledge means knowing where it is written...

Interested in:

- Optimization

- Mathematical Modelling

- Improvement of my programming skills

Answered

Creating a sequence with repeating numbers

b = repelem(1:430,1,2) or for a column: b = (repelem(1:430,1,2))'

Creating a sequence with repeating numbers

b = repelem(1:430,1,2) or for a column: b = (repelem(1:430,1,2))'

3 jours ago | 1

Answered

How to read whole image dataset, and how to resize all images at once?

I suggest to read about <https://de.mathworks.com/help/matlab/ref/matlab.io.datastore.imagedatastore.html ImageDataStore> and re...

How to read whole image dataset, and how to resize all images at once?

I suggest to read about <https://de.mathworks.com/help/matlab/ref/matlab.io.datastore.imagedatastore.html ImageDataStore> and re...

3 jours ago | 0

Answered

4 non-linear differential equations with ODE45

working scripts: %% V�rdier % parametre: % Carrying capacity k1 = 500; k2 = 600; k3 = 700; % De incubated males and ...

4 non-linear differential equations with ODE45

working scripts: %% V�rdier % parametre: % Carrying capacity k1 = 500; k2 = 600; k3 = 700; % De incubated males and ...

4 jours ago | 0

Answered

How do I solve for three unknown parameters using only one constraint equation?

you should rewrite your function as *f=d(P)* with known constants (*R*) and use <https://de.mathworks.com/help/optim/ug/lsqcurve...

How do I solve for three unknown parameters using only one constraint equation?

you should rewrite your function as *f=d(P)* with known constants (*R*) and use <https://de.mathworks.com/help/optim/ug/lsqcurve...

4 jours ago | 0

Answered

How to save a variable from an anonymous function?

for nonlcon it's not necessarily an anonymous function that is needed. you can also use a "normal" function, so that you can sav...

How to save a variable from an anonymous function?

for nonlcon it's not necessarily an anonymous function that is needed. you can also use a "normal" function, so that you can sav...

4 jours ago | 1

Answered

Reshape Matrix Size Marlab

<https://de.mathworks.com/help/comm/ref/bi2de.html>

Reshape Matrix Size Marlab

<https://de.mathworks.com/help/comm/ref/bi2de.html>

5 jours ago | 0

| accepted

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...

7 jours ago | 1

| accepted

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...

7 jours ago | 1

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...

8 jours 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>

8 jours 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>

8 jours ago | 0

| accepted

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)

8 jours ago | 0

| accepted

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>

8 jours ago | 0

| accepted

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

9 jours 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>

9 jours ago | 0

| accepted

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 = ...

9 jours 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))'

9 jours 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/...

9 jours ago | 0

| accepted

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...

9 jours ago | 0

| accepted

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...

9 jours 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;...

10 jours 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...

10 jours 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

12 jours 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*...

12 jours 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 ...

12 jours ago | 0

| accepted

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>

15 jours 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...

15 jours ago | 0

Answered

Rearranging an equation containing the linsolve function

Residuals = CoefficientsMatrix*A

Rearranging an equation containing the linsolve function

Residuals = CoefficientsMatrix*A

15 jours ago | 0

| accepted

Answered

sum matrix column to get another matrix

G1 = squeeze(sum(G,2));

sum matrix column to get another matrix

G1 = squeeze(sum(G,2));

16 jours ago | 0

| accepted

Answered

remove Nan from a row vector using if statement only

Datan=ch(~isnan(ch));

remove Nan from a row vector using if statement only

Datan=ch(~isnan(ch));

18 jours ago | 0