Parentheses error with a function call

2021 5 10
2 个回答
回答已采纳
更新时间：2021 5 11
5 次查看（30 天）

0 个投票

What is wrong with this function call? It's so basic but don't know what I am missing.
The error is "Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters."
load('mnist.mat', 'testX');
% save('testX'); commented it based on the reply I got for this question
x=testX; % testX is a 529*784 matrix
k=5; numIter=6;
[mu, cll, ill] = gmm(x, k,numIter)
% the function definition starts like this in another file
% function [mu,CLL,ILL] = gmm(x,K,numIter)

4 个评论
显示 2更早的评论 隐藏 2更早的评论

Walter Roberson
Walter Roberson 2021-5-10
编辑：Walter Roberson 2021-5-10
That code looks okay.
save('testX'); % testX is a 529*784 matrix
Note that that save() call would save the entire current workspace to file testX.mat not just the testX matrix.
Jaya
Jaya 2021-5-10
编辑：Jaya 2021-5-10
Ok, I didn't know that. Now, I have kept only the following in its place but still it's the same error. I just unable to figure out where is the problem then.
And this happens irrespective of what arguments I put in the function call. Like just two of them or one of them and changing the function def accordingly.
load('mnist.mat', 'testX');
x=testX; % testX is a 529*784 matrix
k=5; numIter=6;
[mu, cll, ill] = gmm(x, k,numIter)
% the function definition starts like this in another file
% function [mu,CLL,ILL] = gmm(x,K,numIter)
Jaya
Jaya 2021-5-10
编辑：Jaya 2021-5-10
Oh, it's working now!!!!
Turns out this posted code excerpt was perfectly okay. Inside the function definition, there was one ) missing for one line.
Thanks for the save() suggestion.
Walter Roberson
Walter Roberson 2021-5-10
I do not see any problem with the code extract that you posted.
Perhaps the error is inside gmm function .

请先登录，再进行评论。

请先登录，再回答此问题。

 采纳的回答

VBBV
VBBV 2021-5-11

0 个投票

%if true
x = load('mnist.mat', 'testX');
k=5;
numIter=6;
function [mu, cll, ill] = gmm(x, k,numIter)
Assign x directly when loading

4 个评论
显示 2更早的评论 隐藏 2更早的评论

Jaya
Jaya 2021-5-11
Thanks & I did this later. But the actual problem was that, as Walter suggested, a parentheses was missing on a line inside the function definition. But in any case, your answer is more neat and avoids future errors too
Walter Roberson
Walter Roberson 2021-5-11
No, when you assign the result of load of a mat file you always get a struct with one field for each variable name loaded. You would need to reference x.testX to get to the data.
Jaya
Jaya 2021-5-11
编辑：Jaya 2021-5-11
Thanks again for the reply. What I meant in my previous answer was I did in the way you proposed in the beginning. I didn't know that VBBV's answer and your answer would give different result into x and that's why i commented like that thinking they give same x.
I didn't see any button for accepting your answer..
Walter Roberson
Walter Roberson 2021-5-11
Assigning the output of load() is a good idea... it just isn't the reason you had the problem in this situation, and the change was not coded for correctly in VBBV's answer.

请先登录，再进行评论。

更多回答（1 个）

Walter Roberson
Walter Roberson 2021-5-11

0 个投票

[copying down from correct comment]
I do not see any problem with the code extract that you posted.
Perhaps the error is inside gmm function .

类别

在 帮助中心 和 File Exchange 中查找有关 Matrix Indexing 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