Community Profile

photo

per isakson


KTH

1,875 total contributions since 2010

Contact

per isakson's Badges

  • 36 Month Streak
  • Thankful Level 3
  • Guiding Light
  • Revival Level 2
  • Knowledgeable Level 4
  • First Answer
  • Leader
  • Speed Demon
  • Promoter
  • Commenter
  • Solver

View details...

Contributions in
View by

Answered
Dimensions of matrices being concatenated are not consistent.
See: Debug a MATLAB Program and Examine Values While Debugging and TUTORIAL: how to ask a question (on Answers) and get a fast...

11 hours ago | 1

| accepted

Answered
Add toolbox to MATLAB manually
"Is it possible to use it for the 2018 version" most likely "license is needed for this product" no it's free to use Insta...

11 hours ago | 1

Answered
Error using + Matrix dimensions must agree.
Observation: for t1=1:length(y(1)) for t2=1:length(y(2)) Why loops? The length of one element is always ONE. I m...

1 day ago | 0

Answered
I want an if-else statement to check whether the a part of the input is a decimal or not? The following program gave an error for input (2.3, 4, 5, 6)
I get a warning (not an error) and that's because 2.3 isn't an integer. >> day_diff( 2.3, 4, 5, 6 ); Warning: Intege...

3 days ago | 0

Answered
How to create an structure fields from an cell array?
The old way %% namesoftags = {'timeaxis','cputime','flux','volts'}; data1 = [ 1,5,298,53 2,9,284,35 3,0...

3 days ago | 0

Answered
Having trouble with "Index exceeds the number of array elements (1)" error
The error occur in the line M=line([0,L1*cosd(angt1r(k)),x(k)],[0,L1*sind(angt1r(k)),y(k)]); Here the variables angt1r, x ...

3 days ago | 1

| accepted

Answered
Example for marine vessel energy system
There was a similar question a couple of weeks ago. See my answer. On my system open_system('pe_marine_electrical_system'); w...

3 days ago | 0

Answered
Undefined function or variable 'profile'.
Documentation says: MATLAB® Compiler™ supports the full MATLAB language and almost all toolboxes based on MATLAB except: Mos...

4 days ago | 0

| accepted

Answered
how to find the square of the number
This produces something that is close to the result you want %% x(:,3)=[2;3;4;5;6]; len = size(x,1); y = nan( len-1, 1 ); f...

4 days ago | 0

| accepted

Answered
How to create a login interaface with a mask password
Search the FileExchange for password gui and see Get Authentication and Password & spinner controls in Matlab GUI

5 days ago | 0

| accepted

Answered
Not enough input arguments
abs and max are Matlab functions, which requires input. Thus disp(abs) disp(max) are wrong. What did you intend?

5 days ago | 0

Answered
Matlab floating point problem
The script %% x = rotx(45*pi/180)*[1 2 3]'; y = rotx(-45*pi/180)*x; is1 = abs((y-[1;2;3])<eps(10)) returns is1 = 1 ...

7 days ago | 0

Answered
I need a Wind turbine simulation model using Statcom and grid connection. Is there anyone to help me out?
Search the File Exchange for wind turbine simulink

7 days ago | 0

| accepted

Answered
Extract some data from a cell
This typically happend when reading a text file with textscan. A simple solution is to insert datelist = datelist{1}; before...

7 days ago | 0

| accepted

Answered
joining string variables in a table with strjoin and rowfun
Replace rowfun(@(aa, bb) {strjoin({aa,bb}, '_')}, T, 'InputVariables', {'b', 'c'}) by rowfun( @(aa,bb) {strjoin([aa,bb],'_')}...

8 days ago | 0

Answered
How to get the sum of numbers below a desired number in sets?
"data is very big" How big is that? Does it fit in the memory? Test this function function b = cssm( a ) %{ b =...

8 days ago | 0

Answered
How to qpsk a text file containing hexadecimal data of an image
See comm.QPSKModulator System object

11 days ago | 0

Answered
how to menchester encode or qpsk a text file
Replacing LoRa_Menchester_Decoding(menchester_output); by Menchester_Decoding(menchester_output); makes the code run withou...

11 days ago | 1

| accepted

Answered
Where to get tutorial models
I copied and run your statement. After a few seconds the Simulink window with the model appeared. I'm at a university and Mat...

11 days ago | 0

Answered
Take the nanmean of every four points in a dataset.
"I need to get hourly averages of this [15-min] data set which also contains nans" Old time approach %% data_set = randn(109,...

11 days ago | 0

Answered
multiply specific column of a matrix by specific element
>> A = [1 2 3; 4 5 6; 7 8 9]; >> A(:,2) = A(:,2)*2 A = 1 4 3 4 10 6 7 16 9 >> And se...

12 days ago | 0

Answered
How can I adapt a summation function (see below) with a for loop to create a "x to the power of n" function without using the "^" operator?
Try function [answer] = raised(x,n) answer = 1; for ii = 1:n answer = answer * x; end end and test >...

13 days ago | 1

Answered
I know this is an invalid expression on line 9. How can I correct this error? Also, what error is this exactly? Matlab displayed multiple possibilities when trying to correct it.
Replace case (3 5 7) by case {3,5,7} With curly brackets "what error is this" It's break the switch-case-otherwise syn...

14 days ago | 1

| accepted

Answered
I have a 9x1253 matrix: i found the max values of this matrix, but i need to find what row and column they belong to and show that.
See the subsection Largest Element in Matrix of https://se.mathworks.com/help/matlab/ref/max.html In response to comment...

14 days ago | 0

Answered
Why is my GUI program producing an error when I 'Run' it
The error message states that the function plotchar isn't found. >> plotchar 'plotchar' requires Character Recognition Exampl...

15 days ago | 1

| accepted

Answered
My code works as a script file but produces errors as a GUI function, how do I fix it?
One observation sortKey = sort(numKey); ... x = find(numKey ~= sortKey); x2 = x([2,1]); x will be empty if numkey is alread...

16 days ago | 0

| accepted

Answered
preallocate array without initializing
Try this >> A(100,100) = 0; >> whos A Name Size Bytes Class Attributes A 100x100 ...

16 days ago | 0

Answered
How to specify the output type of an fread(fid...) ?
Try this little experiment (based on the first example in the doc) %% fid = fopen('nine.bin','w'); fwrite(fid,[1:9]); fclose...

16 days ago | 0

| accepted

Answered
MATLAB has encountered an internal problem and needs to close
Shit happens! If this problem is reproducible, please submit a Service Request via: http://www.mathworks.com/support/con...

16 days ago | 0

Load more