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annotate isEquidistant.m @ 1198:2924b3a9b921 feature/d2_compatible

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Add OpSet for fully compatible D2Variable, created from regular D2Variable by replacing d1 by first row of D1. Formal reduction by one order of accuracy at the boundary point.
author Martin Almquist <malmquist@stanford.edu>
date Fri, 16 Aug 2019 14:30:28 -0700
parents b43c4d841afe
children
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b43c4d841afe Add isEquidistant function for testing vectors
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1 % Tests if consecutive elements of vector v are euidistant
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2 function b = isEquidistant(v)
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3 if length(v) < 2
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4 error('sbplib:isEquidistant:inputTooShort', 'Input vector is too short');
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5 end
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7 tol = 1e-8;
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8
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9 d = v(2:end) - v(1:end-1);
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10 err = abs(d - d(1));
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11
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12 relErr = err./abs(d);
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14 I_zero = find(d < tol);
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16 relErr(I_zero) = err(I_zero);
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17
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18 b = all(relErr < tol);
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19 end