Percentage increase and decrease from two matrices

2022 12 22
1 个回答
更新时间：2022 12 22
4 次查看（30 天）

0 个投票

Attaching two matrices A1 and B1. I want to calculate the percentage increase and decrease
deltaSignal = (B1 - A1);
percentageDifference = deltaSignal ./ A1;
A1 from B1. Total percentage increase and the total percentage decrease. I have done some part which I am writing here.

5 个评论
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Jan
Jan 2022-12-22
What is your question? Write down the mathematical definition of what you want to calculate. Then it is easy to convert this to Matlab.
Joydeb Saha
Joydeb Saha 2022-12-22
When I make the spatial map of D = B1 - A1, I found that there are some areas where I get some positive values and maximum are negative values. Therefore I want to have the total percentage change in terms of positive and negative.
Jan
Jan 2022-12-22
@Joydeb Saha: Again: Please write down the mathematical definition of "the total percentage change in terms of positive and negative". While the description as text is not really clear, you do need a mathematical representation of what you want to calculate. Then the conversion to Matlab will be very easy.
Joydeb Saha
Joydeb Saha 2022-12-22
Ok, let me explain more clearly. See the attached image of Ice. When I make the plot for D = B1 - A1, I have this image, where you may see that there are some blue pixels, these are the positive values (Indicates the ice increase). i want to have the percentage of increase of ice (blue pixels).
Jan
Jan 2022-12-22
@Joydeb Saha: How do you define "the percentage of increase of ice" mathematically? The image does not clarify this.
A mathematical definition of "percentage" means: A number of X divided by a number of Y times 100. So what are your X and Y for "total percentage increase and the total percentage decrease".

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回答（1 个）

Image Analyst
Image Analyst 2022-12-22

0 个投票

You need to convert the image from RGB values to values on the color bar. See attached demo where I did that for a thermal image.

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