# Dave B

### MathWorks

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

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**Content Feed**

How can I graph an average and individual participant data?

It's a little difficult to visualize what this looks like, but here's what i took away from looking at your code you have a thi...

10 dagen ago | 0

scatter not ploting matrix

Yes this functionality was just recently introduced in R2021a The relevant section from the release notes reads: Scatter Plo...

11 dagen ago | 0

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Why do I receive "Index exceeds the number of array elements (1)" ?

You wrote: For some background, m and t are both defined already in my workplace and they are both vectors. But you redefine...

11 dagen ago | 0

Drawing a line to divide two parts of a curve

You can draw a vertical line very easily with xline area works well for filling a part of the curve x=linspace(-3,3,100); y...

11 dagen ago | 0

51 uniformly-distributed points

You can create uniformly (linearly) distributed values with the linspace function: x = linspace(0, 5, 51) Alternatively, you m...

11 dagen ago | 0

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array indexing returns empty row vector while attempting to locate index corresponding to only certain array values

This is an issue of floating point arithmetic, another way to state the problem is: (.1+.2)==.3 What? How can those not be equ...

12 dagen ago | 0

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Dealing with Data Structures

I think in general it's better if your struct is an array rather than using names of fields in the struct as an array, but if yo...

12 dagen ago | 0

Nested for loop for multipication

I think the question is really how you store your total values (you didn't store them in your snippet, so I'm not sure how you p...

12 dagen ago | 0

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fill missing point in data (x y z 3 columns data)

You can use meshgrid to make x and y grids, and then ismember with the rows flag to find which pairs of x and y are missing: % ...

13 dagen ago | 0

How to locate the plotting title above the legend, where the legend is placed "northoutside"?

You can put a title on the legend, but I think you just want a master title for everything. You can do that by placing your axes...

13 dagen ago | 2

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How to relate data to other data from excel in MatLab?

In general, it's better to think of it not as Height(Name1), but as Height(Species=="Name 1"), this extends to all sorts of data...

13 dagen ago | 0

How do I use output values from a function to plot those values in a script

I think what you're looking for is: [t,~,v] = rocket_euler(30,20) plot(t, v, '.-','color',[0 1 0],'Marker','x','markersize',15...

13 dagen ago | 0

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select one item between two List Box

How about just using the callback of one to deselect the other: % Set up some example listboxes: u = uifigure; lsta = uilistb...

13 dagen ago | 0

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graph with two formulas

You can make the error bars with the errorbar function, but your excel file doesn't appear to include data about error... a=r...

13 dagen ago | 1

Call Function from .m file in command

@L McKeehan - perhaps the most common reason for this is that the function is not on MATLAB's search path. When you try to run a...

14 dagen ago | 0

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What should be the distance between the two cameras?

This isn't a very MATLAB-y answer, but the lenses in stereo cameras typically try to replicate the distance between the eyes (ac...

14 dagen ago | 0

Trying to change columns in a Matrix

Specifying rows and columns makes MATLAB point to rectangles: a(1:2,1:4) refers to rows 1 and 2, columns 1 through 4, i.e. MATLA...

14 dagen ago | 1

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Showing the equation of the best fit lines per graph

Are you struggling with how to get the text? or how to display it on the chart? Here I put them in the legend, and also added...

14 dagen ago | 0

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Get ticks to lay across colorbar

The unit for TickLength is peculiar. If you check out how it's documented on the colorbar page it says: Tick mark length, speci...

14 dagen ago | 0

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Index of value when you want to check multiple elements at the same time between 2 cell arrays

If I understand the quesiton, you want to find indices in A where the values in B are found when they are in A. You can use ...

14 dagen ago | 0

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How can I generate random varaible from 0 to 1 without including 0?

The rand function generates randum numbers between 0 and 1, not including 0 or 1: https://www.mathworks.com/help/matlab/ref/ran...

14 dagen ago | 0

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Can I Use the matlab in the mobile phone or tablet rather than laptop?

Yes there's information about MATLAB mobile here: https://www.mathworks.com/products/matlab-mobile.html It's pretty difficult t...

14 dagen ago | 0

semilogy, loglog do not work in order to set the y axis on a logarithmic scale

When you use the log plotting functions they don't change the axis scale if hold is on. There's a note all the way at the bottom...

14 dagen ago | 1

How to plot a matrix containing NaN?

pcolor specifies color at the vertex, which (confusingly) means that you have one less row and column. It does great with NaN th...

14 dagen ago | 1

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How do I combine my function's output matrices into a single matrix?

Your function loops over some values and for each one computes a row vector. To store the row vector in a matrix, specify an i...

14 dagen ago | 0

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How to compute a vector

Here's how I'd break this down. First, let's have a look at what the syntax produced for X: X=[1,2,3;4,5,6] So X is a matrix...

15 dagen ago | 1

Stacked plot /waterfall plots to visulaise figures

If you want to put these data into a waterfall, you can do waterfall(e') but that won't get your time axis correct. Using meshgr...

16 dagen ago | 0

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How to plot readed audio files in multiple plots or subplots by MATLAB

It looks like you're as far as getting the filenames, but need to read the data and make the plots. audioread works well for ...

16 dagen ago | 0

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Array indices must be positive integers or logical values.

It looks like when you gave findpeaks a sampling rate it converted the units to time: From the findpeaks documentation page: [...

17 dagen ago | 0

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How can I specifiy the colors when using the group by color option in boxchart?

BoxChart will use the colors in the active 'colororder', you can change which index they use with SeriesIndex but I'd recommend ...

17 dagen ago | 0