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# BOB

26 total contributions since 2017

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Question

Rearranging an equation containing the linsolve function
Hi folks, I have used the following equation to determine A: A = linsolve(CoefficientsMatrix,Residuals) For determining A, Co...

2 months ago | 1 answer | 0

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Question

Solve 100 equations, each with a different amount of unknowns in matlab
Hi folks, I have 100 equations which I want to solve simultaneously. There are 9 unknowns (A, B, C, D, E, F, G, H, J). Not eac...

3 months ago | 1 answer | 0

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Question

Why does this code output all values as 1?
Hi there, I'm trying to program a piecewise geometric function into matlab: I have written the code as follows. If anybody ca...

3 months ago | 2 answers | 0

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Question

Principal Component Analysis Reconstructing Centred Data
Hi, I have the following dataset which I have performed PCA on: DATASET = 10.0000 6.0000 11.0000 4.0000 8....

5 months ago | 0 answers | 0

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Question

Find flattest line from matrix of vectors plotted against x values
Hi there, I have a matrix of y-axis coordinates, which I'm plotting against a constant set of x-axis coordinates. I want to det...

7 months ago | 1 answer | 0

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Question

'The 'Start' matrix must have the same number of columns as X.' - Error when using Kmeans
Hi, I want to carry out an iteration of k-means clustering. I am using the tutorial found at https://uk.mathworks.com/help/sta...

8 months ago | 1 answer | 0

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Question

Can't loop k-clustering gap stat function
Hi folks, I want to loop the following function 20 times to determine the mode of the "OptimalK" output from the evalclusters...

8 months ago | 0 answers | 0

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Question

Call first row from zero-padded matrix - only call the non-zero values
Hi folks, I have a zero-padded matrix. I'm aware A(:,1) would call the first row of matrix A, but I want to only call the val...

11 months ago | 1 answer | 0

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Question

Remove empty rows from matrix
Hi folks, I have the following matrix: 0.6857 0.1248 0.9636 1.0884 0.4807 0.6077 0.3644 0 ...

12 months ago | 1 answer | 0

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Question

Save variable from each run through of a loop into .mat file?
Hi folks, I have my looped function if true for Z = 1:length(ev_longitude) x1 = -4:10; ...

1 year ago | 1 answer | 0

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Question

Save variable in workspace but remove from memory?
Hi folks, I've managed to loop my function to (correctly) determine the distance travelled by each line through the grid cell...

1 year ago | 1 answer | 0

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Question

Convert cell array to two row vector
Hi folks, I have the following cell array: hvix = [2x1 double] [2x8 double] [2x15 double] [2x1 d...

1 year ago | 2 answers | 0

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Question

Store sets of values as indices in a matrix?
Hi, I have a function which produces a set of horizontal and vertical graph axes intercepts. There are 120 sets of these int...

1 year ago | 1 answer | 0

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Question

Reshape matrix whilst maintaining pairs ordering
Hi, I have a 2 x 120 matrix which I'm trying to reshape to a 120 x 2 matrix. To do this I'm using the following code: y =...

1 year ago | 1 answer | 0

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Loop to carry out calculation for pairs 1 and 2, then pairs 2 and 3 and so on.
Cheers folks! Works great.

1 year ago | 0

Question

Loop to carry out calculation for pairs 1 and 2, then pairs 2 and 3 and so on.
Hi, I have two 8x1 matrices. One matrix is list of longitude coordinates (Final_Longitude_Values). The other matrix is the co...

1 year ago | 3 answers | 0

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Question

Calculate how far a line travels through each square in a grid created using the meshm function
Hi, I have plotted a grid using the meshm function over a map with earthquakes and seismic stations plotted. Between each earthq...

1 year ago | 0 answers | 0

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Question

Overlay a grid on a map
Hi, I have produced a map (using the worldmap function) with latitude limits of 55 to 65 and longitude limits of -5 to 10. I ...

1 year ago | 0 answers | 0

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Question

Plot travel path of earthquake to a seismological station
Hi, I have 4 column vectors: Station latitude, station longitude, earthquake epicentre latitude and earthquake epicentre long...

1 year ago | 0 answers | 0

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Question

Merge two columns of a cell array into one
Hi, I have two columns of cell values: <</matlabcentral/answers/uploaded_files/105933/Untitled.png>> I want to merge t...

1 year ago | 1 answer | 0

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Question

Plotting text on the x-axis for residual analysis
Hi, I want to plot residuals against station name with station name on the x-axis. The x-axis values are in a 192x1 cell arra...

2 years ago | 1 answer | 0

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Question

Determine averages for duplicate values
Hi, I have a cell array (11708 x 1) called "merged" where each value is the station name and the channel. I also have the re...

2 years ago | 1 answer | 0

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Question

Find values outside of a range when calculating residuals.
Hi, I'm trying to find all my residuals above 3 and below minus 3 and extract the corresponding records to an excel sheet. I kno...

2 years ago | 1 answer | 0

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Question

Plot categorical data as data labels on an x,y plot
Hi, I've plotted distance on the x-axis and acceleration on the y-axis. These values are from a string array. Within this...

2 years ago | 0 answers | 0

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Question

Removal of spike at beginning of filtered signal time series plot
Hi, I have several plots of a filtered signal, all of which have a spike at the beginning which I would like to remove. Is th...

2 years ago | 1 answer | 0