Error assignment of elements with ode15s
显示 更早的评论
I get the error "??? In an assignment A(I) = B, the number of elements in B and I must be the same."
I have tried debugging and evaluating the sizes of the left and right hand side of the culprit line but they are the same size (this is true for all values of t). When I evaluate the line in my workspace I do not have a problem. Below is the context of the problem:
Does anyone know why I am getting this error?
function dc=prob(t,c,A)
%system of odes with experimental data (A) passed to function
%odes are evaluated using ode15s at prescribed times from experimental data
dc=zeros(3,1);
V=2;
K=3;
km=4;
t_exp=xlsread('RawData.xlsx','raw data','E8:E47'); %experimental times
ind=find(t_exp==t); %find the time point being evaluated at this point
B=A(ind); %locate the experimental data value corresponding to time point
dc(1)=km*c(3);
dc(2)=(V*B/(K + B ))*(c(1)/(km + c(1))); %THIS IS THE LINE THAT CAUSES THE ERROR
dc(3)=V+c(2);
采纳的回答
Walter Roberson
2013-3-17
0 个投票
ind=find(t_exp==t) is going to return ind as a logical vector that could have 0, 1, or multiple values set. Usually 0. If it does not happen to have exactly one true value, then B will not have exactly one value, and then the expression for dc(2) will be trying to store 0 or more-than-one values into a single scalar location dc(2)
3 个评论
Jeanine
2013-3-17
Walter Roberson
2013-3-17
At the command line, give the command
dbstop if error
and run the program. When it stops due to the error, examine the values then.
Jeanine
2013-3-26
更多回答（1 个）
Azzi Abdelmalek
2013-3-16
编辑：Azzi Abdelmalek
2013-3-16
A bracket is missing, it should be
dc(2)=(V*B/(K + B ))*(c(1)/(km + c(1)))
类别
在 帮助中心 和 File Exchange 中查找有关 Ordinary Differential Equations 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
