Units help to plot

Question

Nina Perf 2021-9-20

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1457194-units-help-to-plot

编辑： Nina Perf 2021-9-22

采纳的回答： Walter Roberson

I want to convert values in a table column to a range of -1 to 1 units.

My -1 value is -800

My 0 value is 300

My 1 value is 800

The column values go from 0 to 800.

How can I do this?

Thanks!

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the cyclist 2021-9-20

编辑：the cyclist 2021-9-20

在 MATLAB Online 中打开

x = [-800 300 800];

y = [-1 0 1];

figure

h = plot(x,y,'.:');

set(h,'MarkerSize',32)

Nina, an infinite number of curves can be drawn through the three points you have specified. None of them are linear (so it is not what I would think of as a simple "conversion".)

Do you have any additional information that would be helpful in what you are trying to do? As I have mentioned in another of your questions, please try to be complete in what you are asking for.

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Answer 1

Walter Roberson 2021-9-21

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1457194-units-help-to-plot#answer_791619

在 MATLAB Online 中打开

values = randi([0 800], 1, 10)
values = 1×10
   709   747   795    14    63   285   232   537   508   183
b = [-800 300 800];
mask = values < b(2);
scaled(mask) = (values(mask)-b(1))./(b(2)-b(1));
scaled(~mask) = (values(~mask)-b(2))./(b(3)-b(2));
scaled
scaled = 1×10
    0.8180    0.8940    0.9900    0.7400    0.7845    0.9864    0.9382    0.4740    0.4160    0.8936