MATLAB: How to add values in a vector based on repeating values on another

arrayindexingmatrixsumvector

I have two vectors of the same length

and

. I want it to be so that everytime a value in the first array repeats(for example the 2 in 1 and 9) the values in the second array would add up(so 7.8953..+8.5184).

Best Answer

accumarray(first_vector, second_vector)

This requires that first_vector is positive integers. The size of the result will be max(first_vector) x 1

Related Solutions

MATLAB: Select the indexes corresponding to the n lowest values in a vector.

[Values,Indices]=mink(vector,n)

MATLAB: Repeating values on colorbar

According to the doc, Tick mark labels, specified as a cell array of character vectors, a string array, a numeric array, a character vector, or a categorical array. By default, the colorbar labels the tick marks with numeric values. If you specify labels and do not specify enough labels for all the tick marks, then MATLAB® cycles through the labels.

Below is one workaround

close all; clc;
indexedImage = imread('cameraman.tif');
% Make it go from 0 - 2:

indexedImage = 2 * mat2gray(indexedImage);
imshow(indexedImage);
limColorBar = 2.0; 
colormap('hot');
caxis([0,limColorBar])
hcolorBar = colorbar(); 
hcolorBar.LimitsMode = 'manual';
hcolorBar.Limits = [0,limColorBar];
temp = hcolorBar.TickLabels;
hcolorBar.Ticks = [str2double(temp(1)) str2double(temp(2)) str2double(temp(3)) str2double(temp(4)) str2double(temp(5))];
hcolorBar.TickLabels = round((1/17)*hcolorBar.Ticks,2);   %scalefactor 1/17 for 1.6mag; 4/83 for 2.5mag

Another workaround

close all; clc;
indexedImage = imread('cameraman.tif');
% Make it go from 0 - 2:
indexedImage = 2 * mat2gray(indexedImage);
imshow(indexedImage);
limColorBar = 2; 
colormap('hot');
caxis([0,limColorBar])
hcolorBar = colorbar(); 
hcolorBar.LimitsMode = 'manual';
hcolorBar.Limits = [0,limColorBar];
hcolorBar.Ticks = linspace(0,limColorBar,5); %This depends on limcolorbar value
hcolorBar.TickLabels = round((1/17)*hcolorBar.Ticks,2);   %scalefactor 1/17 for 1.6mag; 4/83 for 2.5mag
xlabel(hcolorBar, 'mm/min') ;

Hope this helps!

Best Answer

Related Solutions

MATLAB: Select the indexes corresponding to the n lowest values in a vector.

MATLAB: Repeating values on colorbar

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