Hi, I'm wondering if I can do this in R. I have a data set with questions (x-value) and respondents (y-value). If the respondent answered the question they get a 1 and if the respondent didn't answer the question they have a 0. Is there anyway where I can graph something similar to a grid where if a person answered a questions (value of 1) a cell gets shaded and if a person didn't answer (value 0) the cell doesn't get shaded.
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