# Kevin Holly

### MathWorks

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**Content Feed**

How do I get the brush tool to ignore points?

figure scatter(rand(20,1),rand(20,1),'g') hold on scatter(rand(20,1),rand(20,1),'b') Right Click and select "Export Brushe...

8 days ago | 0

How do I identify unique rows based on multiple columns and calculate the average of the rest of the columns?

A = [1 4 3 8; 4 5 6 9; 1 6 3 6; 2 6 9 3; 1 5 3 7] I am going to assume that any row that columns 1 and 3 are identical, irregar...

8 days ago | 0

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how to calculate the average?

Lilya, You do not need to create a for loop (see vectorization) I would also suggest using the mean function instead. temp ...

8 days ago | 0

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How to calculate sum area of a particular coordinate?

@mohd akmal masud Sorry for the late reply. I was going through old comments and discovered that I wasn't following this questio...

8 days ago | 0

Create a specific colormap for a contour plot

Type "colorbar" in the command window to view the colorbar. You can then see the limits of the colormap. You can change the limi...

9 days ago | 0

How to I make data evenly spaced when displaying on a plot?

Have you tried using strips?

13 days ago | 0

Merging Tables from 3 other tables

You can use join S12 = join(S1,S2); Sall= join(S12,S3) You can also use Join Tables in the live editor. If you don't want ...

14 days ago | 0

How to know the value of my point on the colorbar?

x = 0.1:0.01:0.19; y = 0.1:0.01:0.19; z = 0.1:0.01:0.19; [X, Y, Z] = meshgrid(x, y, z); f = X.*exp(X.^2 + Y.^2 + Z.^2); f...

14 days ago | 0

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How to plot four dimensional data?

This was just answered here: https://www.mathworks.com/matlabcentral/answers/1563276-how-plot-4d-data?s_tid=srchtitle

14 days ago | 0

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Borghi Diagram in MATLAB

This is how I would do it. First plot the lines and change the scales to log. %Plot lines plot([10 1 .1 10^4],[.1 1 10 10^2....

14 days ago | 1

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Comparing ones in a table

Here is one way of doing it. t = table; t.column1 = randi([0 1],[7 1]); t.column2 = randi([0 1],[7 1]); t.column3 = [0 1 1 ...

14 days ago | 0

How to store function values generated by a for loop?

I added outputs to your functions called z. clc;clear x = [-2,-1,0,1,2,3]; y = [1,4,11,16,13,-4]; d0 = difdiv(x,y); d = d0(...

14 days ago | 0

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Whenever I try to use my function f(x,y) I get an error message that says that I need to define f.

I do not have the error when I run it. f = @(x,y) x+y; f(6,7) Are you defining f as a variable afterwards as such? f = @(x,y...

14 days ago | 0

Please explain for me this code , and what does each function do in detail ?

This was answered here: https://www.mathworks.com/matlabcentral/answers/3338-lagrange-interpolation-m

14 days ago | 1

filling matrix in matlab code

matrice = zeros(10); for i=1:10 matrice(1,i)=i; end matrice

15 days ago | 0

How can I correct the wrong size of a variable (matrix instead of a vector)?

This line here creates a matrix. When one numerical value (n) is entered into the zeros function, it creates a n by n matrix. m...

15 days ago | 1

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How to show that calculation is going in MATLAB App

You can create a status text in the App Designer by dragging "Label" onto your app in Design View. You can edit the font, alignm...

15 days ago | 0

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Flip a matrix from 31 x 1000 to 1000 x 31 and retain same order of elements

You can tranpose the matrix with a ' matrix = rand(3,10) matrix_transposed = matrix'

15 days ago | 1

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How do I change color diffusion in jet colormap?

%% Example data x = (2:-0.1:0); data = sin(x); %% Shift the values towards the center, so you get a circle instead of an an...

16 days ago | 1

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I want to change the name of elements in a variable

You can save a string array with those names as such: Countries = ["UK";"Canada"; "France";"Italy";"Japan";"United States"]...

17 days ago | 0

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Select particular 3D volumes of a 4D matrix

matrix_4D = matrix_4D(:,:,:,[1:11 14:29]);

20 days ago | 1

How do I find means of samples and then mean of the means?

Although it sounds like a homework question, I'll answer it since it is basic. random = randi(1000000,1000,25); mean_row = mea...

22 days ago | 0

How can I create a data table and export it as an excel file?

Hey bobby! Glad to see you again! Here you are: datadirectory = '/Users/name/Desktop/data/'; import = dir(fullfile(datadir...

23 days ago | 1

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Adding labels to fsurf contour lines

You can add text by entering the following: text(0,30,160,'Text Label','Fontsize',12) where 0, 30, and 160 are the x, y, and...

25 days ago | 0

How to assign xlabel,ylabel from my selected popup menu list?

If App Designer: value = app.DropDown.Value; value2 = app.DropDown2.Value; value2 = app.DropDown2.Value; if value == 'Opti...

25 days ago | 0

How to find the intersection of a fitting line with a logarithmic y-axis?

A= [10 40 60 80]; B = [5 6 7 8]; scatter(B,A,20,'filled') set(gca,'YScale','log') % Polyfit p = polyfit(B,A,2);% 2nd or...

25 days ago | 0

how to find peaks for 100%,75%,50%,25% of the max peak

I'm not entirely sure what peaks you are trying to identify. Below are techniques you can use. You can add labels to your pea...

25 days ago | 0

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How do I obtain a 2D or 3D representation of a georeferenced raster?

You can use the surf function. Below are links to some examples: https://www.mathworks.com/matlabcentral/answers/598591-how-to-...

26 days ago | 1

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