MATLAB: Logical vector equality

vector equality

Often I run into a situation where I need to determine if two vectors are equal and do something if they are. However, vec1==vec2 gives me a vector – not a logical 0 or 1. So I have to mess with that and it seems that Matlab should be able to tell me if two vectors or even structures are equal. However, I am not smart enough to figure how to make it do that without writing extra code every time it arises.

My question is how to I get a 0 or 1 result from v1==v2 when they are vectors?

Best Answer

all(vec1==vec2)

and if you want to ignore the difference between column and row vectors do

all(vec1(:)==vec2(:))

There's also this way to compare

isequal(vec1,vec2)

With the isequal you don't have the problem with the dimensions mismatch like you have with the case vec1==vec2

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MATLAB: ReadMatrix/for loop issue

I've never heard of the function readMatrix. I'd suggest using the function readtable if your CSV file has headings as well as data. (This answer here on importing CSV data may also help). You also need to refer to the column (or table heading) and row number in your if conditions.

In the example below, I assume your csv file has the same heading names you used in your if statemets:

myData = readtable('myfile.csv');
[numRows, numCols] = size(myData);
for i = 1:NumRows
    if myData.Chest_Pain_Type(i) <=3 && myData.Induced_Angina(i) <=0 && myData.Age(i) <=55 && myData.Chest_Pain_Type(i) <=1 && GmyData.Gender(i) <=0
        Patient0utput = 0;
        
    elseif myData.Chest_Pain_Type(i) <=3 && myData.Induced_Angina(i) <=0 && myData.Age(i) <=55 && myData.Chest_Pain_Type(i) <=1 && myData.Gender(i) >0 && myData.Resting_ECG(i) <=1 && myData.Chest_Pain_Type(i) <=46
        Patient0utput = 1;
    
    % etc etc etc
    
end

Note: Although, I must say, you seem the have mutliple statements that are useless in some of your if conditions. For example, it seems pointless to me to have both

Chest_Pain_Type <= 3

and

Chest_Pain_Type <= 1

because if the value is less than or equal to 1, then the condition of being less than or equal to 3 is useless?

MATLAB: Find something strange when using rot90. the matrix are not equal nor equal. In this case 33 appears in the answer.

http://www.mathworks.com/help/matlab/ref/if.html

An evaluated expression is true when the result is nonempty and contains all nonzero elements (logical or real numeric). Otherwise, the expression is false.

The A==B is not true because there is at least one element that does not match. The A=~B is not true because there is at least one element that does match. So you get the third possibility.

Best Answer

Related Solutions

MATLAB: ReadMatrix/for loop issue

MATLAB: Find something strange when using rot90. the matrix are not equal nor equal. In this case 33 appears in the answer.

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