Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I have to create an heap map from a matrix of double values (both positive and negative), but how can I get a color from those values within a range between green and red?
Thanks
Assuming green is positive and red is negative like in most red-green heatmaps, find the most positive value among the positive values and divide them by it and then find the most negative value among the negative values and divide them by it. Multiply the ratios for the positive values by 255 for green and keeping red as 0 and the ratios for the negative values by 255 for red and keeping green as 0. So when the value is 0, it should be black; when the value is at the most positive, it’s fully green; when the value is at the most negative, it’s fully red.