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Why am I getting the error "Array indices must be positive integers or logical values"?
MATLAB uses 1-based indexing, so the first element is accessed with index 1, not 0. This means array indices must be positive i...
9 months ago | 13
| accepted
'splitapply' syntax to index multiple columns in a timetable
I really wish splitapply did allow you to pass a table as input and apply the same function to each column of that input. Unfor...
3 years ago | 1
Accuracy of polygon approximation
Other possible metrics commonly used to measure the error of a polygon simplification algorithm involve comparing the perimeter ...
3 years ago | 0
group by indexing discontinuous timetable
Here's one possible solution; it first checks for criteria 2 and then goes back to verify #1. You can probably do it all in one...
3 years ago | 0
| accepted
define different color for area
I don't think an area plot allows for multiple colors within a single area object. You could accomplish the color change using ...
3 years ago | 0
| accepted
Problem adding a field to a struct via function
Your function doesn't return any output. Modify it to do so: function MeshInfo = generateTriangleCount(MeshInfo) SizeTriangle...
3 years ago | 1
| accepted
Name Contour levels outside plot
Using builtin contour-related functions... no, not really. Contour labels are one of the least customizable parts of Matlab gra...
3 years ago | 1
Combine data from multiple netCDF files
What are the dimensions of the total dataset? And do you really need to hold the entire thing in memory at once? I think you...
3 years ago | 0
How to plot a 3D cube based if i have the coordinates of the 8 surrounding nodes?
To expand on Star Strider's answer, in your example, you've specified a list of coordinates, but you haven't told Matlab how the...
3 years ago | 2
| accepted
How to plot a map like this in Matlab?
Do you want to replicate that plot exactly, or just the general concept? If the former, I'd recommend looking at m_map, since i...
3 years ago | 0
Matrix math with Datetime arrays
As you discovered, implicit expansion of is only supported for numerical arrays (though I'm not sure where that's documented.) ...
3 years ago | 0
Timetable_Averaging values from each month
I don't believe you can use retime to build a climatology; for that, I usually use the splitapply function. Unfortunately, spli...
3 years ago | 0
A simple scatter plot from a 2d matrix
Are any of these what you're looking for? a1=rand(5,1)*3; a2=rand(5,1)*3; [x1, x2] = meshgrid(sort(a1),sort(a2)); % sort for ...
3 years ago | 2
| accepted
How do I create a for loop with fields of structures?
In your current code, you're saving over P on each iteration of the loop. Instead, save to an array: nt= length(Global_Data.Fi...
3 years ago | 0
| accepted
Multiple axes in a subplot
You can achieve the multiple-axis look by layering different axes on top of each other. There are several File Exchange entries...
3 years ago | 0
| accepted
transform text data like {'1951:Q4'} with quarterly dates to number x axis of a plot
I'd recommend converting your fdate cell array to an array of datetimes: fdate = datetime(fdate, 'InputFormat', 'uuuu:''Q''Q');...
4 years ago | 0
| accepted
How to plot coordinate data to appear solid with lighting effect?
The following example shows a relatively simple way to create patch surfaces that connect each circle to the adjacent one (assum...
4 years ago | 0
How do I select data based on multiple indexes?
Assuming that the landwatermask, PerpSurface_saturationflag, and ParSurface_saturationflag matrices are all the same size, and t...
4 years ago | 0
Spread monthly data into days
One way to do the expansion... convert your monthly dates to the first of each month, then use dateshift to check which month ea...
4 years ago | 2
| accepted
How to reduce data irregularly?
It sounds like you're looking for a line simplification algorithm. These algorithms try to preserve the shape of a polygon or p...
4 years ago | 0
How to set plot color for N curves to be a gradient of N color shades between light blue and dark blue (or any other color)?
I suggest reformatting the color-generating function so that instead of returning the entire gradient colormap, it returns only ...
4 years ago | 3
| accepted
Separating 1D data into clusters and counting the amount of elements in each
If the cluster tolerance defines how close points need to be to their nearest neighbor in order to be called a cluster, then you...
4 years ago | 1
| accepted
How to load .mat data from another folder?
The dir command returns the path to each file in the folder field, so you need to append that to recreate the full path names fo...
4 years ago | 2
| accepted
Plotting three axis with one y axis
I like to do this sort of thing the manual way, using my offsetaxis function. It requires a little more manual coding than func...
4 years ago | 1
cutline of a triangular meshed graph
The simplest way to do this is to simply interpolate z for a set of points defined by x = 0 and y = the range of your y-data. F...
4 years ago | 0
How interp2 deal with edges on bicubic interpolation?
interp2 does not extrapolate. By default, it sets any points outside the data bounds to NaN; you can alternatively choose a dif...
4 years ago | 1
Plotting a point in Matlab
If you just want a single point with an arbitrary size, try plot, and play around with the 'markersize' property. Be sure to sp...
4 years ago | 0
How to find graph density in MATLAB for a given graph G?
You can simply calculate the number of non-zero elements relative to total elements in the adjacency matrix: nnz(adjacency(G))....
4 years ago | 0
| accepted
How to Create Plot of Weights at Spatial Locations (Connectivity Map)
There aren't any pre-packaged functions to do this, but it should be pretty straightforward to create a function the calculates ...
4 years ago | 0
| accepted
What should be dimension of surf(X,Y,Z) 3D?
You just need to transpose Z: surf(hw, rw, Z')
4 years ago | 0
