Using arrow keys to change value

Question

empy 2015-6-29

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https://ww2.mathworks.cn/matlabcentral/answers/225738-using-arrow-keys-to-change-value

编辑： Joseph Cheng 2015-7-1

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Hi, I have a simple question for using the arrow keys.

How can I use the arrow keys to add values to a defined variable?

For example if i have defined;

xpos = 20

ypos = 20

Then I want to use arrowkeys "left" to put xpos = xpos - 1

and arrowkey "up" to put ypos = ypos + 1 for example.

Where should I define the values of xpos and ypos.

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Joseph Cheng 2015-7-1

编辑：Joseph Cheng 2015-7-1

The main question here is are you talking about incrementing/decrementing xpos and ypos during a run of a script/gui? OR have it as a shortcut when typing in the editor?

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Answer 1

Adam Hug 2015-7-1

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https://ww2.mathworks.cn/matlabcentral/answers/225738-using-arrow-keys-to-change-value#answer_184704

There is no way to do this in MATLAB without writing a UI. You can come close to this behavior by doing xpos = xpos + 1 in the Command Window and then hitting the "arrowup" key to go to the previously typed command. You will then need to hit the "Enter" key to execute the command again.