Derivative input is Inf

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Ibrahim Seleem
Ibrahim Seleem 2015-9-8
评论： Sofia Carvalho 2017-4-12
Hi,
I face a Simulink problem at the input of the integration block, which is:
Derivative input 1 of 'test_ahmed/Integrator' at time 0.003375 is Inf or NaN. Stopping simulation. There may be a singularity in the solution. If not, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances)
However,the input of the integration block is not infinity according the scope.
The model belongs to sliding mode control of biped robot in single support phase.
attached with the message simulink model..
Thank you!

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MUHAMMED FASIL
MUHAMMED FASIL 2015-9-28
编辑：Walter Roberson 2015-10-19
Error with attached model.
  1. Use 0.000000001 or so instead of 0 in Integrator initial condition box. Try reducing or increasing number of zeroes until your model runs fine.
  2. Use a delay block in front of "division" block.
Otherwise send ur model to tpfasil2007@gmail.com
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MUHAMMED FASIL
MUHAMMED FASIL 2015-10-19
Dear Ibrahim,
It ran without any error in my PC. Please try disabling algebraic loop error in diagnostic settings as shown in the attachment.
I hope u have also tried with variable step also and trying with ADAPTIVE algorithm
Sofia Carvalho
Sofia Carvalho 2017-4-12
I have a similiar error, I guess: https://www.mathworks.com/matlabcentral/answers/334702-solar-pv-panel-simulink-solver-error

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