Can you help me with this error?

Question

raed bou aram 2016-12-2

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https://ww2.mathworks.cn/matlabcentral/answers/315121-can-you-help-me-with-this-error

评论： Image Analyst 2016-12-24

Hi, I am trying to train matlab with positive and negative instances of a set of images. But, when i run the script it's say this:

Warning: Name is nonexistent or not a directory: C:\Program
Files\MATLAB\MATLAB Production
Server\R2015a\toolbox\vision\visiondata\data_total 
> In path (line 109)
  In addpath (line 86)
  In Ipositivas (line 4) 
Index exceeds matrix dimensions.
Error in Ipositivas (line 6)
negativeImages = negative(negativeFolder);

This is the code I am running:

load('data_total.mat');
positiveInstances = positiveInstances(:,1:2);
imDir = fullfile(matlabroot,'toolbox','vision','visiondata','data_total');
addpath(imDir);
negativeFolder = fullfile('Users','Raedalex','Desktop','MATLAB','Tesis','negative');
negativeImages = negative(negativeFolder);
trainCascadeObjectDetector('TubesDetector.xml',positiveInstances, ...
    negativeFolder,'FalseAlarmRate',0.1,'NumCascadeStages',5);

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Answer 1

Image Analyst 2016-12-2

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https://ww2.mathworks.cn/matlabcentral/answers/315121-can-you-help-me-with-this-error#answer_245715

在 MATLAB Online 中打开

It looks like the folder does not exist. And it looks like data_total is the name of a mat file, not a subfolder of "C:\Program Files\MATLAB\MATLAB Production Server\R2015a\toolbox\vision\visiondata"

Try this:

imDir = fullfile(matlabroot,'toolbox','vision','visiondata');

Also, do you have the Computer Vision System Toolbox installed? What does your "ver" command report?

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Walter Roberson 2016-12-24

It sounds as if negative is an array. but negativeFolder is a string, so you are trying to index an array at a string. For that statement to be valid then negative would have to be a function name or a function handle.