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# Nikolas Spiliopoulos

##### Last seen: 3 Monate ago
69 total contributions since 2016

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Question

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...

3 Monate ago | 1 answer | 0

### 1

Question

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. ...

4 Monate ago | 1 answer | 0

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Question

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...

4 Monate ago | 1 answer | 0

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Question

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...

4 Monate ago | 1 answer | 0

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Question

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...

5 Monate ago | 1 answer | 0

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Question

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...

6 Monate ago | 1 answer | 0

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Question

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...

6 Monate ago | 2 answers | 0

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Question

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...

6 Monate ago | 1 answer | 0

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Question

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]....

9 Monate ago | 1 answer | 0

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Question

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 ...

11 Monate ago | 1 answer | 0

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Question

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...

11 Monate ago | 1 answer | 0

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Question

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...

etwa ein Jahr ago | 1 answer | 0

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Question

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...

etwa ein Jahr ago | 0 answers | 0

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Question

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...

etwa ein Jahr ago | 1 answer | 0

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Question

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...

etwa ein Jahr ago | 1 answer | 0

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Question

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...

etwa ein Jahr ago | 2 answers | 0

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Question

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,...

mehr als ein Jahr ago | 1 answer | 0

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Question

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]; ...

fast 2 Jahre ago | 2 answers | 0

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Question

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...

fast 2 Jahre ago | 2 answers | 0

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Question

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...

fast 2 Jahre ago | 2 answers | 0

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Question

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 ...

fast 2 Jahre ago | 3 answers | 0

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Question

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...

fast 2 Jahre ago | 1 answer | 0

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Question

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...

fast 2 Jahre ago | 1 answer | 0

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Question

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(...

fast 2 Jahre ago | 0 answers | 0

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Question

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...

fast 2 Jahre ago | 3 answers | 0

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Question

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...

fast 2 Jahre ago | 1 answer | 0

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Question

Convert tables to arrays in a for loop
hi there, I have some tables named (data_1, data_2 ,data_3, data_4,data_5) is it possible to convert them to arrays by usi...

etwa 2 Jahre ago | 1 answer | 0

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Question

ThingSpeak internal server error
Hi all, I am trying to send data to thingspeak server through a channel by using the commands thingSpeakWrite. However I g...

etwa 2 Jahre ago | 1 answer | 0

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Question

Sending vectors in things Speak
Hi all, I have created a private channel with 4 fields. The first 3 fields have only one value so it's ok, however the fourt...

mehr als 2 Jahre ago | 0 answers | 0

### 0

Question

Error in Matlab MQTT file
Hi all, I'm trying to run a file regarding the MQTT in maltab, which I donwloaded the from matlab website : https://ch.mat...

mehr als 2 Jahre ago | 0 answers | 0