use parentheses. Otherwise, check for mismatched delimiters.

Question

BOZHENG 2023-1-30

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1902860-use-parentheses-otherwise-check-for-mismatched-delimiters

评论： Steven Lord 2023-1-30

i want to create gui caculator above is my coding

N1=get(handles.N1,'string');
N2=get(handles.N2,'string');
s1=get(handles.s1,'string');
s2=get(handles.s2,'string');
slope1=get(handles.slope1,'string');
slope2=get(handles.slope2,'string');
vm=get(handles.vm,'string');
k=(str2num(N1)/str2num(N2)*str2num(s1)/str2num(s2)*str2num(slope1)/str2num(slope2)^(1/3);
alpha=(k*str2num(s2)-str2num(s1)/((k-1)*vm);
set(handles.coefficient,'string',num2str(alpha));

but command window said Error: File: untitled3.m Line: 298

k=(str2num(N1)/str2num(N2)*str2num(s1)/str2num(s2)*str2num(slope1)/str2num(slope2)^(1/3);

Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.

what i should do thanks

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Answer 1

Arif Hoq 2023-1-30

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1902860-use-parentheses-otherwise-check-for-mismatched-delimiters#answer_1159165

在 MATLAB Online 中打开

use the parentheses at the end of syntax.

 k=(str2num(N1)/str2num(N2)*str2num(s1)/str2num(s2)*str2num(slope1)/str2num(slope2)^(1/3));

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Arif Hoq 2023-1-30

在 MATLAB Online 中打开

alpha=(k*str2num(s2)-str2num(s1))/((k-1)*vm);

Steven Lord 2023-1-30

在 MATLAB Online 中打开

Let's count parentheses. Start with a count of 0. Every time you see ( add 1 to the count. Every time you see ) subtract 1. If you don't get back to 0 by the end of the line or if you ever get to -1 you have mismatched parentheses.

alpha=(k*str2num(s2)-str2num(s1)/((k-1)*vm);
% 0   1         2  1        2  1 23   2   1

You have one more ( than you do ). Where to add the missing ) depends on what you're trying to do.

alpha=(k*str2num(s2)-str2num(s1))/((k-1)*vm);
% 0   1         2  1        2  10 12   1   0
alpha=(k*str2num(s2)-str2num(s1)/((k-1)*vm));
% 0   1         2  1        2  1 23   2   10
alpha=(k*str2num(s2))-str2num(s1)/((k-1)*vm);
% 0   1         2  10        1  0 12   1   0