take the real data type of parameters from the Simulink model
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Hi! What do you think about this?
I'm using R2009b Matlab version. I have my_para.mat set of parameters that are used in my_model.mld.
My problem is related to the data type of these parameters. Even if my 'para1' parameter is used as uint16 in the Simulink model, Matlab takes it as double. What can I do to take the real data type directly from the model? I have a GUI interface and I need only to display these real data types.
Thank you in advance!
4 个评论
TAB
2011-9-15
Can you give some more detail? How you are exporting the parameter values from model to .mat file?
Diana Acreala
2011-9-15
Diana Acreala
2011-9-15
TAB
2011-9-15
I still confused what you want to do.
If you want to get the data types of parameters from model workspace, take handle of model and use get_param() function.
See
http://www.mathworks.in/help/toolbox/simulink/ug/f4-140122.html
See 'model construction commands' to see how to use get_param().
回答（7 个）
Fangjun Jiang
2011-9-15
When you create your .mat file, use the following to set up the value and then save to the .mat file.
para1=uint16(25);
When you try to get the data type of this parameter, use
DataType=class(para1)
4 个评论
Diana Acreala
2011-9-15
Fangjun Jiang
2011-9-15
For that, you need to do DataType=get_param(BlockFullPath,'OutDataTypeStr'), or get_param(BlockFullPath,'CompiledPortDataTypes').
BlockFullPath is the path of the block like 'untitled/Constant'.
If you set para1=uint16(25) in workspace and use it for the Constant block and set its "Sgnal Attributes", "Output data type" as "Inherit: Inherit from 'Constant value'" through its dialog, the output data type of the Constant block will be 'uint16'.
Diana Acreala
2011-9-15
Fangjun Jiang
2011-9-15
get_param() works for vector input which means if you have 100 block handles, it will give you 100 output data types. But, would it be better to show the data type in model directly. Your GUI would be hard to show hundreds of parameters anyway. In your Simulink model,click meny Format->Port/Signal Displays, check "Port Data Types"
James
2011-9-15
0 个投票
In the Simulink model use a Data Type Conversion block. It's in Commonly Used Blocks.
When I've wrestled with this I found it easiest (i.e. most predictable/reliable) to take in everything as doubles and to output it as doubles in and out of the Simulink model.
3 个评论
Diana Acreala
2011-9-15
Diana Acreala
2011-9-15
James
2011-9-15
I was referring to the data.
Turn on the view Fangjun referred to, where port data types are displayed on the model. It will let you confirm what the actual data types are.
Diana Acreala
2011-9-19
0 个投票
9 个评论
Fangjun Jiang
2011-9-19
If you could clarify your question. I think it's still not clear from all the comments. "Even if my 'para1' parameter is used as uint16 in the Simulink model, Matlab takes it as double"?
1. What is class(para1) from the .mat file?
2. When you use 'para1' in the block, did you use uint16(para1)?
3. Why did you say "my 'para1' parameter is used as uint16 in the Simulink model"?
Diana Acreala
2011-9-19
Fangjun Jiang
2011-9-19
Okay, so you've answered my first comment. Most likely, all the data in your parameters.mat are doubles. Can you answer my comment #3?
Diana Acreala
2011-9-19
Fangjun Jiang
2011-9-19
The title of your question is "take the real data type of parameters from the Simulink model". So that is why I keep asking you how do you know a particular parameter in the model is int8 or uint8? Are you asking how to implement a parameter in Simulink model as int8, instead of double?
Diana Acreala
2011-9-19
Fangjun Jiang
2011-9-19
I understand your need. But you didn't seem to understand my question. Let's take an example, if you have a Constant block in the model and you set its value to be para1, using the value in the workspace. By default, the data type is double. You could double-click the Constant block, select the Signal Attributes tab, and set the Output data type. There are many options. That's how do you specify the data type in Simulink. My question is, have you done this? If not, every thing is going to be double. There is no need to show it in your GUI. So, my question is still the same. How do you know the data type of a Simulink block output is int8, or uint8, or uint16?
Diana Acreala
2011-9-20
Fangjun Jiang
2011-9-21
See the comment in my answer. DataType=get_param(BlockFullPath,'OutDataTypeStr')
TAB
2011-9-20
Your question is still not clear. What is 'corresponding block '
If you mean 'constant' blocks and you want output datatype of these blocks then try this.
h=load_system('yourmodel');
CBlks= find_system(h, 'SearchDepth',2,'FindAll', 'on', 'BlockType', 'Constant');
if(~isempty(CBlks))
CBlks_Name=get_param(CBlks,'Name');
CBlks_DType=get_param(CBlks,'OutDataTypeMode');
end
'CBlks_Name' will store names of constant blocks and 'CBlks_DType' will store thier output datatypes. You can send them anywhere you want.
TAB
2011-9-20
You may using parameter name in the 'Constant value' field of constant block.
Try
CBlks_ValStr=get_param(CBlks,'Value');
using get_param() you can retrieve the properties of model and any blocks. Similarly you can set thier properties using set_param().
For list of model and block properties please see
TAB
2011-9-22
hhmmm......
Answer is in you question itself (See comment). gcs specifies the currently selected system or subsystem.
Take handle of model and use it with find_system(). Also go through the option available for find_system().
doc find_system
mdlhandle=load_sysetm('MyModel');
blks = find_system(mdlhandle, 'Type','block');
% OR
blks = find_system(mdlhandle, 'FindAll','on','Type','block');
listblks = get_param(blks, 'BlockType');
listblksname = get_param(blks, 'Name');
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2011-9-15
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