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I just found out the answer to my problem. It is due to a very strange way these things work.

When I dump ALL the parameters

rosparam load dump4.yaml

I got the correct ways such as

keys_to_twist: {angular_scale: 0.4, linear_scale: 0.5}

but when I do rosparam load dump5.yaml

I got

{angular_scale: 0.4, linear_scale: 0.5}

so when I load this file, another set of parameters get added! So I have the original keys_to_twist/angular_scale and another angular_scale and therefore the correct values are not set in the parameters it should go.

the solution is to set the yaml file as

 keys_to_twist: {angular_scale: 0.3, linear_scale: 0.6}

I just found out the answer to my problem. It is due to a very strange way these things work.

When I dump ALL the parameters

rosparam load dump4.yaml

I got the correct ways such as

keys_to_twist: {angular_scale: 0.4, linear_scale: 0.5}

but when I do rosparam load dump5.yaml

I got

{angular_scale: 0.4, linear_scale: 0.5}

the solution is to set the yaml file as

 keys_to_twist: {angular_scale: 0.3, linear_scale: 0.6}

The funny thing I found out even later is that the loading of parameters from a launch file does not work at all like this

If you load the parameters from a launch file you have to go again to

{angular_scale: 0.4, linear_scale: 0.5}

otherwise you would have two times the "key_to_twist" part.