MATLAB: Compare MAT files and return logical output

comparedifferentfileloadmatMATLABsamevisdiff

How do I compare two MAT-files so that I get 1 if they are the same and 0 if they are different?

I know this "visdiff" function will give me an HTML report on their similarities, but all I want is if they are the same or not.

Best Answer

This can be done by loading in the MAT files to specific variables and then calling the "isequal" function.

>> A = load('matfile1.mat'); 
>> B = load('matfile2.mat'); 
>> isequal(A,B)

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MATLAB: Do I not notice performance differences when saving MAT-files to an SSD vs an HDD

In MATLAB, compression can be a large bottleneck of save operations. In the test code above, 90% of the time is spent compressing the data that will be written to the MAT-file. Thus, the performance results observed are not accurately depicting the comparative speed of writing to different storage drives.

In order to isolate the performance of writing to disk, time a 'save' operation that does not compress the data being saved.

You can do so by calling 'save' with the flags '-v7.3' and '-nocompression'. The first flag, '-v7.3', lets you save to a Version 7.3 MAT-file, which supports saving large variables without compressing them. The second flag, '-nocompression', allows you to save without compressing your data. You can see an example of both of these flags in use here:

https://www.mathworks.com/help/matlab/ref/save.html#bvmu1wo.

Using these flags will make a 'save' operation significantly faster, and will allow you to observe distinct performance differences when saving to different types of drives.

MATLAB: How to use custom date labels for the x-axis in MATLAB plots

It is more convenient to format the tick labels using the "XTick", "XTickLabelMode" and "XTickLabel" properties of the axis object (vs. using "datetick" function):

>> figure
>> box on
>>
>> % Start, end and number of ticks...
>> startDate = 7.3457e+05;
>> endDate = 7.3458e+05;
>> numbertick = ceil(endDate - startDate);
>>
>> % Plot them
>> xData = linspace(startDate, endDate, numbertick);
>> plot(xData,ones(size(xData)));
>>
>> %%Modify the axes properties
>> set(gca, 'XTick',xData)
>> set(gca, 'TickDir', 'out');
>> set(gca, 'XTickLabelMode', 'auto');
>>
>> % Modifying the labels
>> labels = get(gca, 'XTickLabel');
>>
>> for i = 1:length(labels)
>>     if i == 1 || i == ceil(length(labels)/2) || i == length(labels)
>>         labels{i} = datestr(xData(i), 'mm/dd');
>>     else
>>         labels{i} = '';
>>     end
>> end
>>
>> set(gca, 'XTickLabel', labels)

Best Answer

Related Solutions

MATLAB: Do I not notice performance differences when saving MAT-files to an SSD vs an HDD

MATLAB: How to use custom date labels for the x-axis in MATLAB plots

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