# Thorsten

### Universität Gießen

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how can I edit a matrix and rename it at the same time?

You can do it like this: my_matrix = rand(4,9); edited_matrix = my_matrix; edited_matrix(:,8) = [2;4;6;1];

4 years ago | 0

Different colours for arrows in quiver plot

Create a circular colormap: cmap = colormap(hsv(360)); In the loop: compute the angle and an index into the colormap from...

4 years ago | 1

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how do i change subfunctions to a switch

switch question case 1 % code of function 1 case 2 % code of function 2 case 3 % code of function 3 otherwise ...

4 years ago | 0

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Find the perfect overlay of 2 maps of points

You can maximize the number of perfect matches, that is the number of red points with zero distance to a blue point.

4 years ago | 0

one two three four

Replicate B such that is is as long or longer than A, then cut it to the length of A; B = repmat(B, 1, ceil(numel(A)/numel(B)...

4 years ago | 0

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Error using horzcat Dimensions of matrices being concatenated are not consistent.

You can only concatenate vectors horizontally if they have the same number of rows. But here you have 256 and 18 rows. sp this d...

4 years ago | 0

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Text in while loop creating matrix

You have to use cell arrays if you want to mix text and numbers. And fprintf returns the number of printed bytes, so you directl...

5 years ago | 0

could anyone help me how to check the idx position containing value is not equal to zero

To check if any value of idx is zero, you can use any(idx == 0)

5 years ago | 0

I have a 101 by 23 matrix, where first column is the ID of persons. I want to extract each value of every person <1.5, and store them in a new matrix, SO resultant matrix should have all values <1.5 and rest can be substituted to 0.

lowscale = numData; lowscale(lowscale < 1.5) = 0;

5 years ago | 0

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Ich brauche Hilfe mit der Matrix

1:1 umgesetzt muss es doch 1 statt l heißen: verbraucher_AC=everything(s,1); leistung_AC=Leistungswert(s,1);

5 years ago | 1

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Rearrange halves of yaxis in graph

i = find(x == 1.25); y = y([i+1:end, 1:i]);

5 years ago | 1

How do i bring the user(cursor) to the 1st figure plot out of many figures ?

fig(1)

5 years ago | 0

How can I generate random number between 1 and 10, and at the same time I want to exclude number 3 & 6?

x = setdiff(1:10, [3, 6]); r = x(randi(numel(x)));

5 years ago | 4

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using 2 indexs for loop

for i=1:length(mHome) for k=1:2:size(mHome,2)-1 output1(i,k)=pdist([mHome(i,k:k+1);mBall(i,1:2)]); end end

5 years ago | 1

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I keep getting undefined function when preallocating

index = 1:30; % Preallocate S1QAmb = zeros(size(index)); % index has to be defined before it can be used for i = index S...

5 years ago | 0

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How to save the output of a loop with sequential file numbers.

for i:size(bounding_box, 1) face_crop = imcrop(I, [227,227]) filename = sprintf('%02d.jpg', 2*i - 1); imwrite(fac...

5 years ago | 0

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Common legend for multiple histograms in subplots

Set the FaceColor explicitly before calling legend: set(line1, 'FaceColor', 'r') set(line2, 'FaceColor', 'g') set(lin...

6 years ago | 0

how to create a video with a looming stimulus

This version works without exporting. In the code you can first choose 'test' to see if the sequence of images is what you want ...

6 years ago | 0

Incorrect number of output arguments for 'pre_test_fixpt'. Expected 1, but found 2.

You show code for pre_test, but the error is about pre_test_fixpt. Have a look at how you call this function in your code.

6 years ago | 0

Why am I getting two different plots for the exact same matrix?

Maybe it helps if you transpose the matrix to get it right.

6 years ago | 0

Converting third dimension of 3D matrix to 1xN object

struct(ii).Image = A(:,:,ii);

6 years ago | 0

here I am trying to get the random matrix with the elements only 1 and 0 where none of columns and rows can be 0 only and also the number of 0s and 1s should be in a percentage of 30% and 70%.

N=5; % size ok = false; maxiter = 1000; i = 1; while ~ok & i < maxiter ...

6 years ago | 1

Setting certain pixels in a grayscale image to RGB (red) for MIP

From the above discussion, I came up with this solution: % fake some data X = rand(10, 10, 23); N = prod(size(X)); ...

6 years ago | 1

Calculate weighted average of a 2D matrix

X = rand(376, 481); w = rand(1, size(X, 2)); Xw = bsxfun(@times, X, w); m = mean(Xw, 2);

6 years ago | 0

How to make axis invisible? But not xlabel and ylabel!

The trick is to create handles to the labels and use these handles to re-set the color of the labels after the color of the axes...

6 years ago | 0

i want code to convert image to text

You can use deep learning networks from the neural networks toolbox: nnet = alexnet; % Load pretrain...

6 years ago | 0

interpolating Sample data to finer increment

Vq = interp2(X,Y',Weights, -17.5:0.5:17.5, (-15:0.25:15)');

6 years ago | 0

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How to set the y-axis values to be only integers?

plot(x) a = axis; axis([a(1) a(2) 0 4]); set(gca, 'YTick', 0:4)

6 years ago | 2

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what is the difference between double and im2 double?

im2double converts to double and rescales the image to [0, 1].

6 years ago | 1

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Finding out values for elements of an array from corresponding array elements?

You can represent your weights as a matrix using NaN for the diagonal elements that do not exist: Weights = [NaN, 0.79,0.31...

6 years ago | 0

| accepted