Community Profile # Kevin Holst

### US Air Force

Active since 2012

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How can I change contents of a string?
I'd say do something like this: names = strrep({data{:,1}},'/','-'); That assumes that all of the names are only in the ...

casi 10 años ago | 0

Solved

Sum of diagonal of a square matrix
If x = [1 2 4; 3 4 5; 5 6 7] then y should be the sum of the diagonals of the matrix y = 1 + 4 + 7 = 12

alrededor de 10 años ago

Solved

Given an unsigned integer x, find the largest y by rearranging the bits in x
Given an unsigned integer x, find the largest y by rearranging the bits in x. Example: Input x = 10 Output y is 12 ...

alrededor de 10 años ago

Calculate difference between two times
since you're getting this from a data file I'd suggest something like this: fid = fopen('data.txt'); data = textscan(fid...

alrededor de 10 años ago | 0

Loop Principal Component Analysis
I'd suggest looking at the help page a little more for PCA: http://www.mathworks.com/help/toolbox/stats/princomp.html "COE...

alrededor de 10 años ago | 0

Saving structs
If you're wanting to save the structure as a structure, don't put in the -struct flag. That saves all of the fieldnames as their...

alrededor de 10 años ago | 2

| accepted

breaking a column of strings in two different columns
It appears that you can't really do matrix operations on cell arrays like: mycell{:,2} = mycell{:,1}(3:end); So here's w...

alrededor de 10 años ago | 1

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Writing a matrix as column vectors
If Y is a workspace variable that is an m x n matrix, then you can extract the column vectors by: y1 = Y(:,1); etc. Is that...

alrededor de 10 años ago | 0

set default properties ERROR
It looks as though you may have a variable named 'set' in your workspace. Is that the case?

alrededor de 10 años ago | 1

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surf plot behaves strange!
Surf attaches a color to a face based on one point on that face, and each face will be created by 4 points, so that color may no...

alrededor de 10 años ago | 0

GRIDDATA suitability for interpolating from one mesh to another
griddata (in this case griddata3) is going to be removed in a future release of Matlab. Use TriScatteredInterp instead. I've use...

alrededor de 10 años ago | 0

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How to create random vectors of the same lengths?
from the documentation: Examples Generate values from the uniform distribution on the interval [a, b]. r = a + (b-a).*ra...

alrededor de 10 años ago | 0

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for loop
You can't call or write to a variable like that in a loop, unfortunately. My suggestion would be to have a structure that contai...

alrededor de 10 años ago | 0

Plot points with unknown column numbers
Here's the fix, sorry it took a while. Got distracted ;) figure(2) names = 1:1:rx; for i =1:1:rx name = i; ...

alrededor de 10 años ago | 0

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Plot points with unknown column numbers
did you turn hold back off? figure(2) names = 1:1:rx; for i =1:1:rx name = i; plot (fx,fy,'bo') ...

alrededor de 10 años ago | 0

geting value as Inf
Here's what I think your code should look like in order to run properly: M=100; r=0.8; alpha=0.45; beta=0.75; g...

alrededor de 10 años ago | 0

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Passing base workspace variables to callback functions
Have you tried using the evalin function, maybe something like: x = evalin('base','var');

alrededor de 10 años ago | 1

geting value as Inf

alrededor de 10 años ago | 0

Rows
column1 = min(mat,[],2);

alrededor de 10 años ago | 1

Solved

Magic!
Check whether the input matrix is a normal magic square: <http://en.wikipedia.org/wiki/Magic_square> Output the logical va...

alrededor de 10 años ago

Solved

Count from 0 to N^M in base N.
Return an array of numbers which (effectively) count from 0 to N^M-1 in base N. The result should be returned in a matrix, with ...

alrededor de 10 años ago

Solved

Arrange Vector in descending order
If x=[0,3,4,2,1] then y=[4,3,2,1,0]

alrededor de 10 años ago

How can i get image from other GUI in a project - i can not use global variable
I'm assuming that the problem is you're unable to use the information you acquired from GUI2. Globals may work, but they're not ...

alrededor de 10 años ago | 2

Solved

pressure to dB?
given x ratio of pressure, find corresponding y dB

alrededor de 10 años ago

need help optimizing this code...
I don't think that will work actually. Try this, it's a little convoluted, but I think it's correct: % this assumes w and s...

más de 10 años ago | 0

color-coding a 2D plot
unfortunately shading interp doesn't seem to work on contourf so here's an inelegant solution to your problem. [x,y] = mesh...

más de 10 años ago | 1

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Problem with displaying output of executable
If you're compiling it as a 'Windows Standalone Application' switch that to a 'Console Standalone Application'.

más de 10 años ago | 0

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color-coding a 2D plot
how about: [x,y] = meshgrid(-10:0.1:10,-10:0.1:10); % just to get some x and y values z = sqrt(x.^2 + y.^2); contour...

más de 10 años ago | 0