isglobal

MATLAB函數isglobal簡介

語法格式：

tf = isglobal(A)

如果A是全局變量，返回邏輯1（true），否則返回0（false）。

程序示例

function streamline_test

close all; clear; clc;

global startx starty startz

isglobal(startx)

startx = 1; starty = 1; startz = 1;

uicontrol ﹙gcf, 'Style','pushbutton','String','starty ++',...

'Position',[250,20,70,25],...

'Callback',{@StartYAdd_Callback}﹚;

uicontrol ﹙gcf, 'Style','pushbutton','String','starty --',...

'Position',[350,20,70,25],...

'Callback',{@StartYMinus_Callback}﹚;

uicontrol﹙gcf, 'Style','pushbutton','String','display',...

'Position',[450,20,70,25],...

'Callback',{@DispNum_Callback}﹚;

end

function StartYAdd_Callback(~, ~)

global starty

starty = starty + 1;

end

function StartYMinus_Callback(~, ~)

global starty

starty = starty - 1;

end

function DispNum_Callback(~, ~)

global startx starty startz

fprintf('startx: %f, starty: %f, startz: %f\n', startx, starty, startz);

end