error in unrecognized variable or function?

2 次查看（过去 30 天）
Abdulrahman Mohamed
评论： Sam Chak 2022-3-25
I want to make calculation at different x values that yeilds r then plotted and put in table in app designer but the problem that there is error that unrecognized variable or function "r''
here is the code
value = app.minPEditField.Value;
Rs=app.RsSCFSTBEditField.Value;
T=app.TREditField.Value;
API=app.APIEditField.Value;
Pb=app.PbEditField.Value;
P=app.CurrentPressureEditField.Value;
min=app.minPEditField.Value;
max=app.MaxPEditField.Value;
uodead=app.uodcpEditField.Value;
uob=app.uobcpEditField.Value;
for xn=14.7:100:max
switch app.SelectCorrelationDropDown_3.Value
case 'The VASQUEZ-Beggs'
a=-3.9*(10^-5)*(P)-5;
m=2.6*(P^1.187)*(10^a);
uob=app.uobcpEditField.Value;
r=uob*(P/Pb)^m;
case 'Debogh'
x=2.6*(P^1.187)*exp(-11.513-8.98*10^-5*(P))
uob=app.uobcpEditField.Value;
r=uob*(P/Pb)^x;
otherwise
disp("please select correlation")
end
end
v=transpose(xn);
y=transpose(r);
m=[v y];
app.UITable.Data=m;
plot(app.UIAxes,v,y)

请先登录，再回答此问题。

回答（1 个）

Walter Roberson
Walter Roberson 2022-3-25
1) Your code does not define r for the case where the switch() does not match either case;
2) Your code is not producing one r value per xn value. At the end of the loop, you are going to have a scalar in r (if you have anything)
3) Your results do not depend upon xn at all
4) After a for loop, the loop control variable is left with the last value it was assigned, which would be a scalar in this case. Your context suggest that you are expecting a vector.
  2 个评论
Sam Chak
Sam Chak 2022-3-25
Rather than directly demanding a solution in a blunt manner, it is polite to request for an explanation for each of the comments, so that you get the idea of how to proceed, and rework your code, if you are interested to learn and gain some knowledge or skills from the experience.
If you are interested merely on the solution, you could hire a professional to help, to achieve more in less time.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Downloads 的更多信息

标签

产品


版本

R2021a

Community Treasure Hunt

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

Start Hunting!

Translated by