清空筛选条件
清空筛选条件

Accessing values of a field of a dataset

2 次查看（过去 30 天）
Mark
Mark 2011-10-24
Hi,
I need to access the values of a field in a dataset but the trick is that I don't know in advance the column name: it's passed to me in a string variable. I'm including below some code to give an idea of what I have in mind.
Thanks in advance
>> TestDSAccess % call the function below from Matlab's prompt
%%%%these two functions go in file TestDSAccess.m
function TestDSAccess()
myDS=dataset([1;2],[3;4],'VarNames',{'F1','F2'})
% this works but I don't know the variable name in advance (see below)
myDS.F1
% I will receive the variable name as a string
addToValue(myDS, 'F1', 7)
end
function result = addToValue(dsVar, strFieldName, number)
% this work but is too verbose and I have to store the result back in dsVar(:, {strFieldName})
temp = double( dsVar(:, {strFieldName}) )
result = temp + number ; %%Works
% this returns another dataset, not what I am looking for
temp = dsVar(:, {strFieldName})
result = temp + number ; %%ERROR!!
% something like the following would be ideal:
dsVar(:, {strFieldName}).data + number; % illegal
end

请先登录，再回答此问题。

采纳的回答

Daniel Shub
Daniel Shub 2011-10-25
You can use dynamic field names:
myDS=dataset([1;2],[3;4],'VarNames',{'F1','F2'});
strFieldName = 'F1';
myDS.(strFieldName)

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Simulink Environment Customization 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