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# Sindar

### University of Colorado Boulder

182 total contributions since 2018

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Deleting/selecting and subsetting specific slices in a multi-dimensional array
This may not be the most efficient way, but you can take that 2D logical array and rebuild your 3D logical array: subset_3D = a...

19 hours ago | 0

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what is the physical meaning of getting peak of higher amplitude in frequency domain by using FFT??
Assuming you kept track of normalization correctly(*), yes, a higher amplitude of the fft corresponds to higher signal strength ...

12 days ago | 0

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Can matlab work with NVIDIA 2gb Graphics card?
It depends on what you're trying to do, but I would think you should be fine. I worked for years on a 8 GB RAM / 1 GB GPU machin...

13 days ago | 0

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Does FFT output vary if I split a signal into windowed time segments instead of using a Hanning Window?
A few things to consider: more time-domain elements --> finer frequency domain spacing. treating the three cuts the same will ...

13 days ago | 0

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Placing a structure within a map container - or is there a different, more suitable way to store this type of data?
You can give tables row names so they are indexible that way: keys = {'Jan','Feb','Mar'}; n_keys = length(keys); data_table =...

18 days ago | 2

Matlab Tasks from proffesor
First one: define symbolic variables write out the expression in linear math notation ask Matlab to rewrite the equation as s...

21 days ago | 0

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Reading a N columns table which sometimes have N+1 columns
Assuming you don't need the '**' info, you could try this solution from the fscanf examples which skips the remainder of the lin...

24 days ago | 0

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1. For x from 1 to 100, calculate y. Use fopen and fprintf to write x and y data into a file named “my_data.txt”. Then use fopen and fscanf to read the data. Show the data in two columns. Function to be used: y = e^(0.02x)
Please don't post homework problems without showing your attempts and asking specific questions. I'm feeling generous, though, s...

24 days ago | 0

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MATLAB Answers Wish-list #5 (and bug reports)
Add a set of pre-written comments for common situations. Things like: "this is clearly a homework problem, please display some ...

25 days ago | 3

Monthly Average from Daily Data
See findgroups for taking the mean based on a grouping variable. See month for converting a datetime variable to its month See...

26 days ago | 0

How to vectorize this code?
frequency=randi([0 578],110,1); axis=[-275:5:270]'; % get indices where axis is negative axis_negative = (axis<=0); % calcul...

26 days ago | 0

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how to use for loop to compute a matrix
Assuming each one produces a 25 x 12852 dist array, you can do this fairly easily. Which dimension do you want to concatenate on...

26 days ago | 0

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Access data in a nested structure array and generate an excel file
[Edited with fixed answer, x2] This throws no errors and appears to produce a correct excel file from your sample data: files ...

26 days ago | 0

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How to write a function which handles strings?
Live editor functionality changes a lot across versions, but my suggestion would be to put your function in a separate cell from...

26 days ago | 0

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How to create a custom colormap in this case?
That is essentially the example here. Using the hex -> rgb converter from this answer: % test image imagesc(rand(10,10)) col...

26 days ago | 1

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Is there any way to output coordinates of a point?
If you want to get the data for an arbirtrary point in your graph, you can add a datatip by clicking with the cursor, then right...

26 days ago | 0

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Add various horizontal lines to a plot Matlab 2016a
See here for a few solutions: https://www.mathworks.com/matlabcentral/answers/2031-adding-vertical-line-to-plot

26 days ago | 0

Scatter Plot only Non-Zero Set of Points
Here's how to do this with a small example script: % create a 5x2 array of random integers 0-5 for both x and y x = randi([0 5...

26 days ago | 0

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Operate on all the columns of a matrix
"N = normalize(A,dim) returns the z-score along dimension dim. For example, normalize(A,2) normalizes each row." norm_mat=norma...

1 month ago | 0

How to make only some part of a y axis label italic? (in boxplot?)
Set the tick label interpreter to tex: ax=gca; ax.TickLabelInterpreter = 'tex'; or set(gca,'TickLabelInterpreter','tex')

1 month ago | 0

How to find the min, max and mean values of 34 timetables stored in a 1 x 34 cell and add them as extra columns to the respective timetables?
Is this what you want to do: Load in a given table (say jj=1) create TT2{1} find the min of TT{1}.temperature add a third co...

1 month ago | 0

How can I set a discontinuous colormap and colorbar range?
Potential solution: Shift the data into a continuous range, then relable the colorbar: cont_data = mydata; % move [351 - 360 ...

1 month ago | 1

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Summation of numbers using prompts
Two errors: The function should not have n as an argument. Wait to ask the user don't use "sum" as a variable name; it's a fun...

1 month ago | 0

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How to compare strings within a loop
No need to loop, strcmpi will compare a string to all strings in an array. If you don't care which string matches, use "any": s...

1 month ago | 0

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I have a timetable with 10 columns that are all binary and I want to add them together so I get a sum of those binary numbers for each row. Is there an easy way to do this?
% example table mytable=array2table(randi([0 1],20,10)); % create column variable with sum sum_all = sum(mytable{:,1:10},2); ...

1 month ago | 0

Plot Problem in Matlab
Assuming you have edited the matlabrc, it may be as simple as you having a scalar logical operator (&&, ||) instead of an elemen...

1 month ago | 0

Modifying a function for the trapezoidal rule to work with a data set instead of an equation?
My suggestion is to check out the built-in trapz function. There are a few formulas there that should help. Another note: your ...

1 month ago | 0

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how to preserve original column headings (variable names) when using writetable
As of 2019b, table variable names don't need to follow normal variable naming rules. This allows for a couple of fixes: T = rea...

1 month ago | 0

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How can I change the size of the text in annotation, and place a border around it?
You are setting the width and height of the box to 0. I believe this should do it, but check here for other properties you may ...

1 month ago | 0

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