# Dave B

### MathWorks

I am a software engineer at MathWorks. My work focuses on graphics and charting.

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**Content Feed**

drawrectangle draws rectangle even though the mouse is clicked outside the parent UIAxes

You can pass in a DrawingArea to drawrectangle which will constrain the rectangle to the image. That keeps the drawn rectangles ...

ungefär 14 timmar ago | 0

Combining Graphs into one Figure

The command figure makes a new figure, so just remove the second call to figure and you should be in good shape! %% Part 1 ...

ungefär 14 timmar ago | 0

What is the exact reason of this error? I am not getting it. Any help will be appreciated.

As @Mathieu NOE points out, there's something a little strange in your col_headers = line. This line has a bunch of extra charac...

ungefär 21 timmar ago | 0

Merging three 3D plots into one

You can copy the surfaces from each of the axes, in each of the figures that you open like this: a=open('BandL_my_replication_v...

ungefär 21 timmar ago | 0

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Issues with greyscale png images in matlab

This looks like the result of loading an indexed image, you can read the colormap using the second output of imread: [img,cmap]...

ungefär 21 timmar ago | 0

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My line plot is not showing

Did you want to plot 1:Ns vs p (without the i)? plot(1:Ns,p)

en dag ago | 0

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How to combine multiple images into an array

You can convert a 'greyscale' RGB image to a 2D image in a few ways. For instance: you could just take one channel (like the red...

en dag ago | 0

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Multiple 3D trajectories displayed on same axis

There's a typo in your code: x1_2 = rmmissing(x1); y1_2 = rmmissing(y1); z1_2 = rmmissing(z1); x2_2 = rmmissing(x1); y2_2 =...

en dag ago | 0

Incomplete Normal Distribution Plot on MATLAB

The function normpdf(x,mu,sigma) will return the pdf of the normal distribution with mean mu and standard deviation sigma, evalu...

en dag ago | 0

How can I calculate log10(variable) ??? there is error..

Assuming you've defined your variable and it's numeric, this should work: variable=100; log10(variable) x=[100 200 500 1000];...

en dag ago | 0

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Convert Python time to Matlab datum

Python has several ways it represents time. A common one is so called unix timestamps, which are the number of seconds since 197...

4 dagar ago | 1

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error when using datetime()

Does it work if you add str2double? like this: S.date = datetime(S.Year, S.Month, str2double(S.Day), 0, 0, 0, 'Format', 'uuuuMM...

4 dagar ago | 0

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How can I build a matrix with an increasing number of terms in each row?

You can't have a matrix with a different number of elements on each row, but if you wanted the sums 1, 1+2, 1+2+3,... (as you de...

5 dagar ago | 0

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Call fields from a struct

I'm a little confused, but I'll venture some guesses.... Do you have a struct init in your workspace (where you're calling th...

5 dagar ago | 0

surf command doesn't plot the value next to NaNs values

If you think of surf as defining a bunch of little rectangles, when one vertex is missing you can't draw the rectangle. Your d...

5 dagar ago | 1

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Printing cell array with skipping a value

If you want to get rid of just the one value, how about setting it to empty inside of matComp. Note that you'll end up with one ...

5 dagar ago | 0

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tiledlayout not forming figures as intended

Just pasting my comment in the answer in case it may help someone else, it struck me as strange that there was a hold on before ...

5 dagar ago | 0

Specifying a sample of data from a table

This sounds like a pretty broad topic, how to index things in MATLAB. You might be interested in this documentation page abou...

6 dagar ago | 0

How to save a figure of a specific size with exportgraphics

you created a tiledlayout in one figure, set some of its characteristics but didn't add anything to it. Then you created a new f...

6 dagar ago | 0

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Saving a functiong graph inside a matrix

You can use im2gray to convert an RGB matrix to grayscale: x = linspace(-5,5,100); y = x.^2; plot(x,y) fr=getframe(gca); gr...

6 dagar ago | 1

add arrowtext outside the figure

annotations are defined with respect to the figure, in the units of the figure. plot(rand(1,10)) pos=get(gca,'Position') o...

6 dagar ago | 0

what does thegrid{1}.points=(1:n); mean?

Cell arrays are containers for heterogenous data, each cell can hold arbitrary types/sizes/shapes. Cells are addressed with { } ...

6 dagar ago | 1

How to make a plot in function of timetables expressed in UTC ?

It's probably easier if you use readtable instead of load, which will pull in the times automatically: t=readtable('Dates.txt')...

6 dagar ago | 1

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Google sheets to table in matlab

You might try this file exchange submission: https://www.mathworks.com/matlabcentral/fileexchange/39915-getgooglespreadsheet An...

6 dagar ago | 0

Why is my plot not working in my for loop?

this isn't running a loop because you're iterating from 1 to length(theta2) and length(theta2) is 0 theta2=linspace(0,2*pi,2*pi...

6 dagar ago | 0

Polymarker geographic contour plot

Yes this is possible. I wouldn't call this a contour plot, it's really more like a bubble plot. You can't make triangles with...

6 dagar ago | 0

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if or for loop

You can find the index of the first and last instance of power greater than 0 using the find function, then put those indices ri...

6 dagar ago | 0

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A function that counts the number of zeros in a vector

you were pretty close, you just didn't need the find, or the /11 D = [ 1 0 1 0 1 0 1 0 1 ...

7 dagar ago | 1

How to call one of two conditions in matlab function?

When you call a function with one output MATLAB will return the first output, the names specified for outputs when calling it ar...

7 dagar ago | 0

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gunzip subfolders at once

You can pass wildcards to gunzip (note that the first example does exactly this): fp = 'C:\Main\Data\subf1\subf2\subf3\subf4\su...

7 dagar ago | 0

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