Help with commands varargin and switch

Question

NS 2011-5-16

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/7541-help-with-commands-varargin-and-switch

[EDIT: Mon May 16 20:51:23 UTC 2011 - Reformat - MKF]

Hello,

I am new to MATLAB and I am trying to understand the code given in the following paper (Matov et al 'Analysis of microtubule dynamic instability using a plus-end growth marker', Nature, 7, 761-768 (2010).

One of the codes uses command varargin and switch. Could someone please explain the use of these command in MATLAB.

Part of the code is given below %START

function [cutoffIndex, cutoffValue, sp, axesH] = cutFirstHistMode(varargin)
% goodDataIdx is used in case data contains nans
goodDataIdx = [];
% check for axesHandle
if ishandle(varargin{1})
    axesH = varargin{1};
    varargin(1) = [];
    verbose = 1;
else
    axesH = [];
end
switch length(varargin) - isscalar(varargin{end})
    case 1 % data
        doHistogram = 1;
        data = varargin{1};
        data = data(:);
%END. I have given only a part of this code.

Your help is truly appreciated.

Thanks.

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Answer 1

Matt Fig 2011-5-16

1
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https://ww2.mathworks.cn/matlabcentral/answers/7541-help-with-commands-varargin-and-switch#answer_10403

Probably the best thing is for you to read the doc on these topics.

VARARGIN

SWITCH

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NS 2011-5-18

Thanks Jan.

I ran the code. The "if" operator processed the true statements if the argument had a positive value (not 0).

eg. when ishandle(varargin{1})=1 the if statement was processed and when the value was 0 the else statements were processed.

Also I understood what varargin stands for after running the code. Thanks once again

Jan 2011-5-18

Be careful: "ishandle(varargin{1})=1" is not a comparison, but a standard bug. You want: "ishandle(varargin{1})==1". "if ishandle(varargin{1})" works also, because ISHANDLE replies a LOGICAL already.

"if X" with a numerical X (even an array!) means explicitely: "if all(X) && ~isempty(X)".

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