Problem in forecasting using GRNN

2 次查看（过去 30 天）
Ulin Nuhaq
Ulin Nuhaq 2020-7-13
编辑： Shubham Rawat 2020-8-10
I will predict some values with GRNN, but I have problem with output values. All output values of testing have same value with last value of output in training.
x =[1 2 3 4 5 6 7 8 9 10] ;
y =[1 4 6 8 10 12 14 16 18 20] ;
xx = 30:35;
[x, map] = mapstd(x);
xx = mapstd('apply', xx, map);
y = mapstd('apply', y, map);
s = 0.3;
grnn = newgrnn(x, y, s);
test_P = sim(grnn, xx);
test_P = mapstd('reverse',test_P,map);
display(test_P)
>>tes
test_P =
20 20 20 20 20 20

请先登录，再回答此问题。

回答（3 个）

Ulin Nuhaq
Ulin Nuhaq 2020-7-17
does anyone know the answer above?
ahmed ayad
ahmed ayad 2020-7-26
the same problem is with me>>>> i think that grnn is not appropraite for prediction>>>
Shubham Rawat
Shubham Rawat 2020-8-10
编辑：Shubham Rawat 2020-8-10
Hi Ulin,
While you are creating network
grnn = newgrnn(x,y,s);
You have used new x and y after changed using “mapstd”, instead of that you may use original values of x and y. That will lead you to desired results.

类别

在 Help Center 和 File Exchange 中查找有关 Define Shallow Neural Network Architectures 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by