Is it possible to automatically pass a predefined value to a variable assigned to questdlg, inputdlg, uigetdir (without the input window pop up)?

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Asit Kumar 2018-6-18

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https://ww2.mathworks.cn/matlabcentral/answers/406114-is-it-possible-to-automatically-pass-a-predefined-value-to-a-variable-assigned-to-questdlg-inputdlg

编辑： Stephen23 2018-6-26

I am coding a plugin to be used together with a previously existing code (function). The existing code CAN'T be modified. It contains 3 input variables, taking inputs from uigetdir, inputdlg, questdlg. But now the values for these variables are assigned in the plugin code. Hence I need to somehow skip taking those inputs in the previously existing code without making any changes to it.

1. Is there a way to skip executing certain commands? For example, for the code: " a = inputdlg('Input','Title')", if some value is assigned to ' a' previously, this line of code will not execute, and pass on to the next lines of code.

2. Or, is there a way to automatically pass a default (predefined) value when inputdlg / uigetdir / questdlg pertaining to certain variable name is executed. For example for the line of code: " a = inputdlg('Input','Title')", the usual pop up for inputdlg will not happen, rather automatically the value of ' a' will be retained/passed from the previously assigned value.

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Stephen23 2018-6-18

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https://ww2.mathworks.cn/matlabcentral/answers/406114-is-it-possible-to-automatically-pass-a-predefined-value-to-a-variable-assigned-to-questdlg-inputdlg#answer_325083

编辑：Stephen23 2018-6-22

在 MATLAB Online 中打开

Ugh, this is an unfortunate situation to find oneself in... my commiserations. One possible solution is to shadow those functions: simply use a persistent variable to store the default value, which will be returned when the function is called again. (obviously this is a hack solution, and I advise you to rewrite the original code)

function out = inputdlg(inp,varargin)
persistent val
if nargin==1
   val = inp;
end
out = val;
end

and then call it like this to store the default:

inputdlg(DefaultValue)
... original code here

and then when it is called inside the existing code it will return the default value.

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Stephen23 2018-6-18

编辑：Stephen23 2018-6-18

在 MATLAB Online 中打开

@Asit Kumar: I don't understand what "The inputs from ' uigetdir' and ' questdlg' are assigned to strtures" means: did you mean to write that the outputs are assigned to structures?

In any case, I don't really see the relevance to my answer. My answer shows you one possible solution that means you don't need to change those lines in the original code, exactly as you requested.

"Ans this line can't be changed."

I know, your question already made that clear, which is why my answer does not require those lines to be changed. My answer requires defining some new functions and calling them before the original code to specify the default values, like this:

inputdlg(DefaultValue) % Calling my special shadow version!
... your original code here

My answer does not require the original code to be changed. If you do not understand shadowing functions, or persistent variables, or how the MATLAB Search Path works, then some internet searches will give you some useful explanations and documentation, there are also plenty of threads on this forum that will explain these things (the search field is at the top of this page).

"Can structure variables/fields like - 'handles.store.Hpath' declared persistent outside the 'existing code'(function)?"

No.

Walter Roberson 2018-6-26

Create a containers.Map that you populate with variable names and associated value. In your rogue version of inputdlg(), use isKey to check whether the first input is in the container, and if it is then return the associated content; otherwise execute replacement prompting code. (Trying to execute the original Mathworks version when your own has the same name is likely to be a ... challenge.)

Stephen23 2018-6-26

编辑：Stephen23 2018-6-26

"Is this achievable? How?"

Inside your function check the input value. Decide what to do based on the value. You will find it difficult to call the original function: you might be able to create a handle to it before shadowing it.

Note that this is an awful hack code and you should rewrite the original code properly.

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