# Nikolas Spiliopoulos

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**Content Feed**

Question

Non convex objective funtion

Hi there, I a have an objective function which in some areas is not convex. Is there any way to relax it and then use fm...

29 dagen ago | 0 answers | 0

### 0

answersQuestion

Clear symbolic from an equation and make it mathematical function

Hi all, I have an equaton of x, using syms x to create it. However afterwards I want to clear the symbolic value and conver...

ongeveer een maand ago | 1 answer | 0

### 1

answerQuestion

Change stem colour of particular values

Hi there, I have a stem plot with 66 points and I would like to change the colour of particular valuesonly. Mpre specifica...

4 maanden ago | 2 answers | 0

### 2

answersQuestion

lenend keep only text

Hi all, I want to put 3 text phrases in a legend wuth red, green, and blue colour respectively (example: 'one' (red), 'two' (...

12 maanden ago | 2 answers | 0

### 2

answersQuestion

Matlab Error "X, Y, Z, and C cannot be complex"

Hi all, I am trying to plot a surface however, I get an error "X, Y, Z, and C cannot be complex." which means, apparently ther...

meer dan een jaar ago | 1 answer | 0

### 1

answerQuestion

Solve Inequality with inequality constraints

Hi there, i am trying to "solve" an inequality (actually looking for the area of possibel solutions), I have tried this. ...

meer dan een jaar ago | 1 answer | 0

### 1

answerQuestion

sort boxplot based on 25-75th percentiles

Hi all, I have a figure with 3 boxplots in it (different colors each of them) However, I would like to sort them...

meer dan een jaar ago | 1 answer | 0

### 1

answerQuestion

Barcharts colours based on other vectors

Hi all, I have 3 vectors a,b,c with 4 numbers in each of them I create another vector d with all the values of vectors a,b...

meer dan een jaar ago | 1 answer | 0

### 1

answerQuestion

Change colour in stem plot, for only particuar values

Hi all, I have a vector that I need to create a stem plot. However, i would like to put a different colour to the 4th and...

meer dan een jaar ago | 1 answer | 0

### 1

answerQuestion

convert a double matrix in cell within a table

Hi all, I have a table with size 420x4 (screenshot attached) However, the first column is a double matrix (420x4) while th...

meer dan een jaar ago | 1 answer | 0

### 1

answerQuestion

Filling a vector with ones based on a given value

HI all again, I have one vector A and a matrix B: Vector A has integers values from 0 to 6, A=[0 1 3 2 0 4 5 2 1 6]' (colum...

meer dan een jaar ago | 2 answers | 0

### 2

answersQuestion

find values in an cell array

Hi all, I have an cell array that is like the one in the screenshot (see attached file). I would like to find in each ro...

meer dan een jaar ago | 1 answer | 0

### 1

answerQuestion

add to extra elements every 4 values and enter particular values

Hi all, I have a vector [1x24] and I would like to add 2 extra elements every 4 elements, so the new vector will be [1x32]....

meer dan een jaar ago | 1 answer | 0

### 1

answerQuestion

Compare the rows of an array with another one's array

Hi all, I have an Array A with dimensions [3500 x 5] And a second array B with dimensions [13x5] How can I check every ...

bijna 2 jaar ago | 1 answer | 0

### 1

answerQuestion

Find missing elements of a vector

Hi all, I have a vector =1:1:80; I have a vector with these numbers=[ 1 3 5 12 34 44 55 62 63 68 69 70 72 75 79]; How can I g...

bijna 2 jaar ago | 1 answer | 0

### 1

answerQuestion

GA optimization within constraints

Hi there, I am trying to use GA for my first time, so I am a bit confused. I have seen some simple example where you defin...

ongeveer 2 jaar ago | 1 answer | 0

### 1

answerQuestion

fmincon convergence - confusion with F-order optimality and Feasibility

Hi all, I have am running optimization using fmincon however I am not sure if the results are satisfying. I am a bit confu...

ongeveer 2 jaar ago | 0 answers | 0

### 0

answersQuestion

Plot multiple errorbars in pairs

Hi again, I have plotted some errorbars using the commands you suggested in my previous question: x=1; y=8.35; sd=4.13; ba...

ongeveer 2 jaar ago | 1 answer | 0

### 1

answerQuestion

plot a single Error bars

Hi all, I am trying to create one error bar but I am struggling a lot. I tried to read the matlab documentation about error ba...

ongeveer 2 jaar ago | 1 answer | 0

### 1

answerQuestion

Save figure as jpg with 600dpi

Hi all, I am trying to save some figures through coding, in jpg format and 600dpi. Hovewer I have tried these, but stil...

ongeveer 2 jaar ago | 2 answers | 0

### 2

answersQuestion

Matlab error "out of memory"

Hi all, I am running an optimization using fmincon. Initially, I run it with 3 minutes timestep and it runs fine. Afterwards,...

meer dan 2 jaar ago | 1 answer | 0

### 1

answerQuestion

Add a number every n values

Hi all, I have a question: If I have an array A=[ 1 2 3 4 5 3 0 2 8 3 2 1 0 3 2 0 0 1 1 0 3 1 5 3 2 8 1 0 3 2]; ...

bijna 3 jaar ago | 2 answers | 0

### 2

answersQuestion

plot a vector with 3 axes

Hi all, I am trying to plot a vector in a graph with 3 axes, but I am confused how to do it. I tried with plot 3. The matr...

bijna 3 jaar ago | 2 answers | 0

### 2

answersQuestion

Convert cell array to an array, when the size of the cells is different

Hi all, I have a cell array like this A={ [0 0 0 0] ; [1 1] ;[2] } Is it possible to convert it in an array? I tried with...

bijna 3 jaar ago | 2 answers | 0

### 2

answersQuestion

makedist discrete uniform distribution

Hi all I am trying to create a uniform discrete distribution, with 5 values (20% probability each), by using makedist command ...

bijna 3 jaar ago | 3 answers | 0

### 3

answersQuestion

Convert a string into a function of x

Hi all, I have created a string like this: Sstr = join(compose('(x(%d:%d)-x(%d:%d))))', A), ' + ') so I get a result: Ss...

bijna 3 jaar ago | 1 answer | 0

### 1

answerQuestion

create indexes of x in a for loop

Hi all, I am trying to create and save some x values in an array in a format of A=[x(2)+x(3);x(3)+x(6);x(4)+x(9)]; so I tri...

bijna 3 jaar ago | 1 answer | 0

### 1

answerQuestion

Symbolic variables in a for loop

Hi all, I am trying to create a sum of, which has x and I want to create a for loop to give me the result below : A= [x(...

bijna 3 jaar ago | 0 answers | 0

### 0

answersQuestion

Create a vector by selection randomly vectors

Hi all, I have 4 vectors A=[1 2 3 4 5]; B=[0 2 5 6 19]; C=[0 0 1 3 0]; D=[1 0 1 15 0]; And I want to create...

bijna 3 jaar ago | 3 answers | 0

### 3

answersQuestion

Objective function in a for loop

hi all, I have an objective function that I want to minimize N=10 f=@(x) ((0.0011*(x(2:1*N)-x(1:N-1)))'*exp(-0.00...

bijna 3 jaar ago | 1 answer | 0