Operands to the || and && operators must be convertible to logical scalar values. Error in logspace (line 23) if d2 == pi || d2 == single(pi)
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i have a vector of current and vector of voltage , i want to get logarithmic samples from both vectors instead of equally spaces. i try current=[...........] voltage=[...........] logspace(current,voltage) it will give me error.
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Wayne King
am 25 Feb. 2014
please tell us what voltage is. For example what does
>>whos voltage
return
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Iain
am 27 Feb. 2014
Assuming that logspace is something you didn't write and you can't change the if statement:
for i = 1:1666
logarithmic_space(i) = logspace(current(i),voltage(i))
end
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Jos (10584)
am 25 Feb. 2014
Apparantly, one of the expressions d2 == .. is not a logical scalar. My first guess would be that d2 is not a scalar, but an array with more than 1 element. Can you insert a
disp(size(d2))
just before the if statement?
Then, what would you like to do when there are more elements in d2. Compare them all to pi? ALL and ANY may help you out here:
help all
help any
In addition, comparing floating points using == is tricky. Take a look here:
d2 = 0.1+0.2+0.3
if d2==0.6
disp('d2 equals 0.6')
else
disp('d2 does NOT equal 0.6')
end
Not quite what you would expected. The solution to compare two floating point values, is to use a tolerance:
if abs(valueOne - valueTwo) < TOL
...
end
where you can define a tolerance.
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