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# Scott MacKenzie

### York University

Last seen: 11 days ago Active since 2020

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Remove arrays from a cell based on certain conditions
If x is an array of numeric data, then if x(1) > x(end) clear x; end will delete the array x if the "first value is grea...

29 days ago | 0

How do i quantize data with N levels?
y1 = discretize(y,8);

1 month ago | 0

Turning categories into double
Let's assume T.Var1 is a categorical column in your table, as you describe it. To convert this to a column of double values, re...

1 month ago | 0

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Is there a way to measure interletter spacing for Fixed Width font in MATLAB?
For text fonts, 1 pt = 1/72 inches. So, if you set the font size of the text to, say, 36 pt., the character height will be 1/2 ...

1 month ago | 0

prepare a table for fitrm and manova
Using the example in the documentation for the manova function, here's a MANOVA for your data (attached): load atb; Meas = tab...

1 month ago | 0

Producing the same-sized box plots for subfigures
One approach is just to use a dummy y-axis label for the plots in the 2nd and 3rd columns: if mod(i,3)==1 ylabel('Data'); ...

1 month ago | 0

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Skipping a line no delimiters in an array
From your comment, it seems you are working with an Excel file, as opposed to comma-delimited text file. Given this and your ...

1 month ago | 0

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Plotting time series of Velocity over 48 hours
% test value for Ttide (not given in question) Ttide = 1; figure(1); Vm=5.07; % Calculated on Paper %t=[1:1:48]; % Time ...

1 month ago | 0

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How to find the common dates between two different variables that are not the same size or format?
% load dt and dt2, as per question load test % ignore minutes and seconds dt = dateshift(dt,'start','hour'); dt2 = datesh...

1 month ago | 0

Array indices must be positive integers or logical values.
You've got a typo in your code. Change the indices 1i to i

1 month ago | 1

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Round all values in table
I think this achieves what you are after: % test data T1 = array2table(rand(5)) % rounded to 2 decimal places T2 = array2tab...

1 month ago | 1

Generate pure tone sequence in frequence domain
Seems you want to start by specifying your signals in the frequency domain, then convert to the time domain. I think this does ...

1 month ago | 0

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Trying to find a value at a specific point in an array.
Just use H(Tmax) BTW, the value is 28106.

1 month ago | 0

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Specify the path of X and Y axis (MATLAB)
After your plot command, add set(gca, 'xlim', [0 1], 'ylim', [0 1]);

1 month ago | 0

Unable to use a value of type string as an index
Inside your loop, change catbl1(catbl1=x)=div*c; to catbl1(catbl1==x)=div*c;

1 month ago | 1

Removing quotations from table display
Seems like you just want a more visually appealing presentation for the user. Something like this might work: vNames = {'a' 'a...

2 months ago | 0

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from a circle to polygon
I know of no such formula, although no doubt one could be put together. You can think of circle as a polygon with a large (in...

2 months ago | 0

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find the lowest value in a selection of data
[m, idx] = min(T(S1,6)); % minimum value in column 6, as per S1 x = T(idx,5); % value in column 5 at same location/r...

2 months ago | 0

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Says "error using plot, vectors must be the same length"
Just a simple mistake. Change the 3rd line to xx1=linspace(0,8.*pi,100); Or, for higher resolution, change all the linspace f...

2 months ago | 1

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Replacing some elements in the row with maximum value along the row
There might be a simpler solution, but this seems to work: A=[1 2 3 0 0; 7 4 5 1 0; 2 4 6 0 3] for i=1:size(A,1) A(i,...

2 months ago | 1

How to prevent Matlab from rounding numbers when it saves them to a variable?
The rounding you are observing occurs through the num2str function. You can control this using one of the other variants of num...

2 months ago | 0

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plotting 2 time series with errorbars along double y axis
I think this is more-or-less what you are after, based on the figure posted: % test data x = 1:10; A = [2 8 6 11 18 19 16 22 ...

2 months ago | 0

How to plot x and y error bars together with the data points?
Something like this seems to work: % test data x = randi([2 8],1,5); y = randi([2 8],1,5); error_x = rand(1,5); error_y = r...

2 months ago | 0

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The loop is continuously running
Your loop is fine, but is inefficient and takes a long time to execute. Instead of the loop, try this: [Lia, Locb] = ismember(T...

2 months ago | 0

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How to grow a vector in a loop?
One approach is to declare coeff as an empty array before the first for-statement: coeff = []; then add new values to the end ...

2 months ago | 0

How to create randi function between 0-500
Just use the imin-imax version of randi. For example n = randi([0, 500], 50, 1); generates a column vector of random integers...

2 months ago | 0

Question

Using F1 for help, gives help for wrong function
Consider this code snippet: plot(x, y1); % 2D line plot hold on; plot(x, y2); % 2D line plot plot(p); % polyshape plo...

2 months ago | 1 answer | 0

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Filling in missing data with previous data to perform calculations
Since you define bad or erroneous data as values equal to 500 or values less than 60, how about this. Replace the erroneous val...

2 months ago | 1

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p value for two sets having variable x and y
Since for each system, y is the measured response for x, you can reduce the data for that set to x-y. Also, since the systems u...

2 months ago | 0

Question

ranksum function is purportedly the same as the Mann-Whitney U test, but the results differ. Is there a reason why?
I've written a script to implement the Mann-Whitney U non-parametric test. As a guide, I used a data set (attached) and example...

3 months ago | 0 answers | 0