Substract two elements in an array

2022 1 30
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Dear MatLab comunity,
I have an array of 8 elements i.e.:
X=[5.03690000000000 5.03140000000000 5.02640000000000 5.02520000000000 5.02370000000000 5.02350000000000 5.02300000000000 5.02310000000000]
I want to subtract the first value from the last value and store it in a variable.
How can I do it? It should be pretty simple, I apologize in advance for that.
Best,
Alex

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