Programming error calling map2qquad. SampleInterval not positive.

Hi,

I am developing a simple circuit with simulink that I have attached to this mail. I get the error:

• Programming error calling map2qquad. SampleInterval not positive.

I have no idea what this means or how to solve it. I suppose it is related to the Operational Amplifier block which, in this circuit, is the default.

Thank you, gianluigi

[Ishan]

Your model seems to be working fine with the following output. Can you provide more information on what you are trying out?

Answer 1

[Gianluigi]

Hi Ishan,

thank you for the answer.

It maybe I have not some setting correctely set. Here is my configuration and a screenshot of what it happens when I try to run the simulation.

gianluigi

MATLAB Version: 9.13.0.2049777 (R2022b)

MATLAB License Number: 566431

Operating System: Microsoft Windows 10 Pro Version 10.0 (Build 19045)

Java Version: Java 1.8.0_202-b08 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode

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MATLAB Version 9.13 (R2022b)

Simulink Version 10.6 (R2022b)

Curve Fitting Toolbox Version 3.8 (R2022b)

DSP System Toolbox Version 9.15 (R2022b)

Data Acquisition Toolbox Version 4.6 (R2022b)

Instrument Control Toolbox Version 4.7 (R2022b)

Mixed-Signal Blockset Version 2.3 (R2022b)

Optimization Toolbox Version 9.4 (R2022b)

Signal Processing Toolbox Version 9.1 (R2022b)

Simscape Version 5.4 (R2022b)

Simscape Electrical Version 7.8 (R2022b)

Spreadsheet Link Version 3.4.8 (R2022b)

Symbolic Math Toolbox Version 9.2 (R2022b)

[Ishan]

Hi Gianluigi,

This error is caused if you set the sample time of any of your blocks to be negative. Try out the attached model file if it works for you. Logging your signals might also help you find out the error.

[Gianluigi]

Hi Ishan,

I tied your version and I have obtained the same error. The only sampling I see is that of the amplifier block, see attachement, that is 10 ns in both your and my design.

The only difference I see is that your project is from the R2023a release, while I am using the R2022b.

Could it depend on this?

Answer 2

[Gianluigi]

I navigated the errors. All starts from the attachement. To sts.SampleTime is assigned the value of 0, while I think the value should be 1e-8.

If I invoke getSampleTime(obj), which is where sts = getSampleTime(obj);, the naswer in the coomand window is:

getSampleTime(obj)

ans =

SampleTimeSpecification with properties:

Type: 'Fixed In Minor Step'

which looks quite strange

gianluigi