Selectively select which points to have error bars

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Fri, 01/16/2015 - 04:14 pm

I am measuring the current of a sample as a function of applied bias. So I have I vs. V. For most of the bias values, I have repeated the measurement twice, and sometimes more, to validate my measurements. For these values of bias that are repeated, I calculated the mean and the standard deviation. Currently, I constructed a wave that have the standard deviations values, but since not all biases have been done more than once, I simply put 0 as the standard deviation for those values. Igor plot the error bars fine, but I don't want error bars for the measurements that have been done only once. But Igor doesn't seem to have any way to achieve that. Any ideas?