Question

What MATLAB functions are underappreciated?
Open question: What MATLAB function(s) do you wish you had discovered sooner? Are there any functions that no one talks about, b...

3 years ago | 8 answers | 4

8

answers

Answered
How to plot the point where two complicated graphs cross?
Does this do it for ya? https://www.mathworks.com/matlabcentral/fileexchange/11837-fast-and-robust-curve-intersections

3 years ago | 0

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Array indices must be positive integers or logical values.
I think this is the error t(2*pi*j/(2*d)) The first time through the loop, j=3, which means 2*pi*j/(2*d) = 0.02 It's tryin...

3 years ago | 2

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How to create a bubble plot with Antarctic Mapping Tool
Hey @Raffaello Nardin, First off, excellent job on creating a minimal working example. That really helps me understand where y...

3 years ago | 4

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Multi Surface Plotting & Color Control of each surface
Try setting the facecolor option using the RGB values. Here are a red [1 0 0] and a blue [0 0 1] surface, using built-in example...

3 years ago | 0

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How to make variable matrix?
In Matlab, the first index of any variable is 1, so T(0) will produce an error. Try T(1) to T(n+1).

3 years ago | 0

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Ackley Function 3D plot
It looks like the code stops at the line that says return. Try putting the function at the bottom of the script and ending it wi...

3 years ago | 0

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Uniformly distributed random variables
Ah, this is a fun question, because the concept it's getting at is quite common across science and engineering. The process of...

3 years ago | 1

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How to select the starting point of a curve and tare all x, y plot data to this point
Perhaps you could find the index of the location where the chage in Y exceeds some critical threshold. You'll have to manually t...

3 years ago | 0

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Contour plot of spatial distribution of temperature
The regular quarter-degree spacing of the data suggests that no interpolation is necessary for this dataset--it just needs to be...

3 years ago | 0

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Calculate mean of gray Value
Try this. Below I'm creating an example matrix M, and calculate the mean of only the values that exceed zero: M = peaks(100); ...

3 years ago | 1

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Interpolation or meshgrid...Error using matlab.internal.math.interp1
Ah, it looks like tt_sort and tt2_sort are in fact sorted, but they contain some duplicate values. The easiest way to work aroun...

3 years ago | 0

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Median filter for an imported Excel file (removing spikes from a signal)
For a 3-point moving median, you can medfilt1 as you suggest, like this: weg_f = medfilt1(weg,3); Or similarly, you could us...

3 years ago | 0

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How to extract specific parts of a matrix
Let's see if I understand what you're trying to do. As I understand it, you have a 512x512 matrix with lots of values of 98 on t...

3 years ago | 1

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Plotting the trend line without plotting the data
Or more simply, polyplot(wspd_3yr,msid_3yr) using the polyplot function found here.

3 years ago | 0

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trend line plotting question
I've written a simple function called polyplot to add a linear trend line to plots. Get it on the File Exchange here.

3 years ago | 0

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How to Plot Time Series Data of a Temperature Map
Hi John, A couple of things: Location number 7 is in Antarctica! The sea surface temperature data is all NaN on land, so ave...

3 years ago | 1

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Climate Data Toolbox: how can i calculate correctly a trend with trend function?
Hi Alessandro, I think you've mostly got it. One key point to note is your sampling frequency is monthly, so 12 times per year...

3 years ago | 0

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Making a Map Image from a Matrix
With the Climate Data Toolbox you could do it like this: T = flipud(reshape(load('TS20040101.txt'),[72 144])); % loads, reshape...

3 years ago | 2

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Answered
Control Text Label on plot with categorical axis
Have you tried using the 'vertical' and 'horizontal' alignment options? plot(5,6,'o') text(5,6,'default text') text(5,6,'ab...

3 years ago | 1

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Calculating values of a dependent variable at a using a range of independent variables
Welcome to the world of Matlab, Tom. Indeed, I think this is pretty straightforward. To make a range of values of Temp between...

3 years ago | 0

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Mapping sea surface temp with specific location? Struggling with geoshow function?
For 3D data cubes of things like ocean temperature, you most often need to permute the first two dimensions when reading in from...

3 years ago | 1

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how to fill geographic plot region with specific color?
To fill the circle, check out the markerfacecolor option in the documentation for geoplot. Alternatively, you may prefer the geo...

3 years ago | 2

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Error with plotting a function
Try this: plot(t,(K.^(1 - (exp(t.*r.*-1)))), '-b'); I put a dot (.) before the exponents and multiplication. That turns it in...

3 years ago | 0

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How to create a best fit line here?
It looks like the first x value is -Inf. Try eliminating that point from the polynomial fit, like this: p = polyfit(x(2:end),y...

3 years ago | 0

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Answered
How do I set each legend on the curve in multiple plot?
Perhaps the issue isn't the legend, but plotting the desired colors? How about specifying the colors of the plots explicitly, li...

3 years ago | 1

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How do I smooth a dataset without built in functions
It's not quite empty--it's just plotting a single point as a tiny dot. That's because you've only solved for a single point. I...

3 years ago | 1

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Mapping a Coastline of the Antarctic showing different boundaries
To make maps of Antarctica, try Antarctic Mapping Tools. For melt data you might cosider my plugin for the Adusumilli ice shelf ...

3 years ago | 0

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Plotting different colored line based on condition(s)
What if you create two lines and plot them separately? x = 0:1000; y = sind(x); % duplicate: y_red = y; y_red(y>0) = ...

3 years ago | 2

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Answered
How can I regrid a climate data model from lower resolution to higher resolution?
If you have a grid of humidity data H that correspond to the 2.5 degree resolution coordinates lat and lon, then you just need t...

3 years ago | 1