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matlabcomparisonlogic
Pippi
Pippi

Reputation: 2571

How do I compare numbers using if and or statements in matlab?

I want to return true if the element of an array b=[1,2,3,4,5] equals 1 or 2 or 5. How do I do this?

Upvotes: 0

Views: 125

Answers (2)

Jonas
Jonas

Reputation: 74940

There are different ways to do that:

  • Test an individual element against one number

    b(1) == 5

  • Test an individual element against several numbers, i.e. is the first element either 1 or 2 or 5?

    b(1) == 1 || b(1) == 2 || b(1) == 5

    %# which is equivalent to

    any(b(1) == [1 2 5];

  • Test all (or many) elements against one number

    b == 1; %# a vector with t/f for each element

  • Test all elements against several numbers

    b == 1 | b == 2 | b == 5 %# note that I can't use the shortcut ||

    %# this is equivalent to

    ismember(b,[1 2 5])

Upvotes: 6

mathematician1975
mathematician1975

Reputation: 21351

It is very simple. To test equality of numbers you simply use the == operator.

if (b(1) == 5)
    %% first element of b is 5 
    %% now implement code you require

similarly you can test equality for any element in a matrix. To test for multiple values use the logical or operator || in conjunction with == for example

if (b(1) == 5 || b(1) == 2 || b(1) == 1)
    %% first element of b is 1,2 or 5 
    %% now implement code you require

Upvotes: 3

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