What function in Matlab is equivalent to the block in Simulink "Transport Delay"?

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Ismaeel
Ismaeel 2017-3-28
编辑： Ismaeel 2017-4-1
I want to use a delay function that does exactly what the block in Simulink "Transport Delay" does. I tried to use the function "delayseq" but that requires sampling frequency along the time delay. Any idea? Thanks in advance
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Ismaeel
Ismaeel 2017-3-28
编辑：Ismaeel 2017-3-28
Hi Walter, thanks for your reply. I use ode15s for solving DAEs system. I have one of the states (only one of them, the rest of states don't include any delay) needs to be delayed by a certain amount of time. The clock is the time that ode15s handles as an output, so I am not using the time variable directly but the states in DAEs are functions of time.

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回答（1 个）

Walter Roberson
Walter Roberson 2017-3-28
ode15s is the wrong function for solving delay differential equations. Have a look at https://www.mathworks.com/help/matlab/delay-differential-equations.html
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Ismaeel
Ismaeel 2017-4-1
编辑：Ismaeel 2017-4-1
Thanks Walter, I have been working on the problem using the function you suggested (dde23 or ddesd) but I realized that these solvers can not solve stiff delay DAEs problems even when I give a very small amount of delay (1e-15). The problem can be solved easily without delay using ode15s function. I hope Mathworks works on stiff delay DE for the future versions of Matlab.

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