Changing significant digits of constant block

Hi all, I have a basic question. I would like to reduce the number of significant digits in the constant block in Simulink. But I do not know how to do so. Can someone help?

Thanks.

Answer 1

[Andy Bartlett]

The constant block is showing the text that is entered for the parameter, and is not showing the evaluated numeric value. You do not have control over that behavior of the constant block.

To customize things, you could put a mask on top of the constant block.

Then using the Mask's Initialization code, you could change the value coming from the mask to some quantized value that the mask passes down to the underlying constant block. For example:

desiredInverseValueSpacing = 1000;
valForConstBlock = round(valFromMaskDialog * desiredInverseValueSpacing) / desiredInverseValueSpacing;
% where valForConstBlock is the text entered on the underly constant blocks
% for the 'Constant value:" parameter

Using Mask's MaskDisplay (aka Icon) code, you could use text manipulation techniques to get the specific text you prefer.

For example:

fprintf(num2str(valForConstBlock,6))

[Ani R]

I see, thanks.

Answer 2

[Walter Roberson]

Right click the block, "open", and edit the text version of the constant.

[Ani R]

But if I connect it to a Knob or some other similar block and vary the constant, it will again show all the digits, won't it?

[Walter Roberson]

I believe that Knobs are used to control Parameters, not Constant Block.

[Ani R]

I see, thanks.